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Merged
cfsmp3 merged 9 commits into from
Dec 18, 2025
Merged

fix(memory): Fix uninitialized memory and memory leaks found by Valgrind #1840

cfsmp3 merged 9 commits into from
Dec 18, 2025

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@cfsmp3 cfsmp3 commented Dec 17, 2025 •
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Summary

Comprehensive memory fixes found via Valgrind testing. This PR eliminates memory leaks, use-after-free bugs, and uninitialized memory issues across both C and Rust code.

Commits

  1. Fix uninitialized memory and memory leaks - Use calloc() instead of malloc() in demuxer/decoder init
  2. Fix use-after-free and memory leaks in Rust FFI - Prevent dangling pointers when copy_from_rust() is called multiple times
  3. Fix major memory leaks in Rust FFI demuxer/decoder - Fix 55MB-331MB leaks in Dtvcc encoder allocation
  4. Fix use-after-free in Teletext - Properly null out dec_ctx->private_data after Teletext context is freed
  5. Fix 608 decoder memory leak - Free DVB bitmap data in dinit_cc_decode()
  6. Fix XDS encoder/decoder leaks - Free xds_str when skipping invalid timestamps
  7. Fix XDS rcwt_loop leak - Add cleanup for --in=bin and --in=raw formats
  8. Fix Rust CI - Update test code for Drop compatibility + formatting

Valgrind Test Results (245 tests)

Test Range Perfect Memory Leaks Timeouts
Tests 1-99 TBD TBD TBD
Tests 100-150 33 0 17
Tests 151-200 48 0 0
Tests 200-245 37 0 4

All tested ranges show 0 bytes definitely lost.

Key Fixes Verified

  • Test 114: 0 bytes (was 100 bytes) - XDS encoder leak
  • Tests 217/218: 0 bytes (was 880 bytes) - rcwt_loop XDS leak
  • Tests 24, 26-28: 0 bytes (was 55MB-331MB) - Rust FFI leaks

Technical Details

C Code Fixes

  • ccx_demuxer.c: calloc() in init_demuxer()
  • lib_ccx.c: calloc() in init_decoder_setting()
  • telxcc.c: calloc() in telxcc_init()
  • general_loop.c: Initialize variables, add rcwt_loop cleanup
  • ccx_decoders_common.c: Free DVB bitmap and XDS strings in cleanup
  • ccx_encoders_common.c: Free XDS strings on invalid timestamp skip

Rust FFI Fixes

  • utils.rs: Add replace_rust_c_string(), free_rust_c_string_array()
  • common.rs: Only set inputfile/enc_cfg on first call to prevent leaks
  • demuxer.rs: Direct C struct manipulation in ccxr_demuxer_close()
  • decoder/mod.rs: Only allocate encoder when ctx.encoder is null
  • common_types.rs: Add Drop for CcxDemuxer to free FFI allocations

Known Pre-existing Issues

  • Test 19: 5536 bytes leaked from teletext with --datapid (complex interaction, pre-existing)
  • Uninitialized value warnings in some tests (not memory leaks)

Test plan

  • Build successfully on Linux
  • Cargo fmt passes
  • Cargo test passes (269 tests)
  • Valgrind tests 100-245: 0 memory leaks
  • Basic functionality verified with sample files

🤖 Generated with Claude Code

cfsmp3 and others added 9 commits December 17, 2025 09:21
@cfsmp3 @claude
fix(memory): Fix uninitialized memory and memory leaks found by Valgrind
89849d3 
Addresses memory issues identified during Phase 5 (Runtime Analysis) of
the bug analysis plan using Valgrind memory checking.

## Changes

### C Code (Uninitialized Memory)
- ccx_demuxer.c: Use calloc() instead of malloc() in init_demuxer() to
  ensure all struct fields are zero-initialized before use
- lib_ccx.c: Use calloc() instead of malloc() in init_decoder_setting()
  for consistent initialization

### Rust FFI Code (Memory Leaks)
- utils.rs: Add helper functions for proper FFI string memory management:
  - free_rust_c_string(): Free a Rust-allocated CString
  - replace_rust_c_string(): Free old string before allocating new one
  - free_rust_c_string_array(): Free an array of Rust-allocated CStrings
- common.rs: Update copy_from_rust() to properly manage string memory:
  - Free old strings before allocating new ones for all string fields
  - Add free_encoder_cfg_strings() to clean up encoder config strings
  - Free old inputfile array before allocating new one

## Valgrind Results Comparison

| Metric              | Before    | After     | Improvement     |
|---------------------|-----------|-----------|-----------------|
| Definitely lost     | 2,371 B   | 1,536 B   | 35% reduction   |
| Indirectly lost     | 212 B     | 0 B       | 100% fixed      |
| Uninitialized errors| 131,095   | 0         | 100% fixed      |

The remaining 1,536 bytes are from services_charsets array in
EncoderConfig (low priority, rare use case).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
@cfsmp3 @claude
fix(memory): Fix use-after-free and memory leaks in Rust FFI
683468e 
This commit fixes critical memory issues found during comprehensive
Valgrind testing:

1. **Use-after-free in inputfile array** (common.rs):
   - Problem: `copy_from_rust` was called multiple times (parse_parameters,
     demuxer_open, demuxer_close), and each call freed and reallocated the
     inputfile array. C code holding references to the old array would then
     access freed memory.
   - Fix: Only set inputfile on the first call (when inputfile is null).
     Subsequent calls skip modifying inputfile since it shouldn't change
     during processing.

2. **Memory leak in enc_cfg strings** (common.rs):
   - Problem: Each call to `copy_from_rust` allocated new encoder config
     strings without freeing the old ones, causing 1,536 bytes leaked per
     demuxer open/close cycle.
   - Fix: Only set enc_cfg on the first call (when output_filename is null).
     Encoder config is static and doesn't need to be re-synced.

3. **Uninitialized memory in telxcc_init** (telxcc.c):
   - Problem: `malloc` was used to allocate TeletextCtx but not all fields
     were explicitly initialized, causing Valgrind to report 400+ errors
     about conditional jumps on uninitialized values.
   - Fix: Changed to `calloc` to zero-initialize all fields.

**Valgrind results improvement (Test 3):**
- Errors: 458 → 21 (95% reduction)
- Definitely lost: 2,304 → 768 bytes (67% reduction)
- Use-after-free bugs: Eliminated
- Double-free bugs: Eliminated

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
@cfsmp3 @claude
fix(memory): Fix major memory leaks in Rust FFI demuxer and decoder
3d5d8e2 
This commit fixes several significant memory leaks found by Valgrind testing:

1. Dtvcc::new encoder leak (decoder/mod.rs):
   - Previously always allocated a new encoder_ctx even when ctx.encoder
     was not null, then threw away the allocation
   - Fix: Only allocate when ctx.encoder is null
   - Impact: Eliminated 55MB-331MB leaks per video processing run

2. ccxr_demuxer_isopen optimization (demuxer.rs):
   - Previously copied entire demuxer structure just to check infd
   - Fix: Directly check (*ctx).infd != -1
   - Impact: Eliminated repeated allocations during file processing

3. ccxr_demuxer_close optimization (demuxer.rs):
   - Previously did full copy roundtrip (C->Rust->C) to close a file
   - Fix: Work directly on C struct, call close() and activity callback
   - Impact: Eliminated copy-related allocations and leaks

4. CcxDemuxer Drop implementation (common_types.rs):
   - pid_buffers and pids_programs contain raw pointers from Box::into_raw
   - These were never freed when CcxDemuxer was dropped
   - Fix: Implement Drop to free all non-null Box pointers
   - Impact: Eliminates remaining FFI-related leaks

Test results show dramatic improvement:
- Test 24: 55MB leak -> 0 bytes (PERFECT)
- Test 26: 9.75MB leak -> 0 bytes (PERFECT)
- Test 27: 237MB leak -> 0 bytes (PERFECT)
- Test 28: 331MB leak -> 0 bytes (PERFECT)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
@cfsmp3 @claude
fix(memory): Fix use-after-free in Teletext and uninitialized variables
7b1a169 
This commit fixes several Valgrind-detected memory issues:

1. Use-after-free in Teletext during PAT changes:
   - When parse_PAT() calls dinit_cap() to reinitialize stream info,
     it freed the Teletext context but dec_ctx->private_data still
     pointed to the freed memory
   - Fixed by NULLing out dec_ctx->private_data in dinit_cap() when
     freeing shared codec private data
   - Also added NULL check in process_data() before calling teletext
     functions to gracefully handle freed contexts

2. Uninitialized variables in general_loop():
   - stream_mode, get_more_data, ret, and program_iter were declared
     without initialization
   - While logically set before use, Valgrind tracked them as
     potentially uninitialized through complex control flow
   - Fixed by initializing all variables at declaration

These fixes eliminate millions of Valgrind errors in teletext tests
(tests 78, 80) and uninitialized value warnings (tests 67, 84, 86).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
@cfsmp3 @claude
fix(memory): Fix 608 decoder memory leak in dec_sub.data
627e085 
The embedded dec_sub struct in lib_cc_decode had its data field
allocated by write_cc_buffer() but never freed during cleanup.

Added cleanup in dinit_cc_decode() to:
- Free DVB bitmap data (data0/data1) if present
- Free the dec_sub.data field itself

This fixes ~1.7MB to ~2.6MB leaks seen in tests 89, 93, and 96.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
@cfsmp3 @claude
fix(memory): Fix XDS memory leaks in encoder and decoder cleanup
4a30434 
- XDS encoder leak: Free xds_str when skipping subtitles with invalid timestamps
- XDS decoder cleanup: Add proper cleanup for leftover XDS strings in dinit_cc_decode()
- Remove incorrect free(p) after write_xds_string() - the pointer is stored
  for later use by the encoder and must not be freed immediately
- Remove xds_ctx free from dinit_cc_decode() to avoid double-free

These fixes address the 100-byte XDS leak found in Valgrind test 114.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
@cfsmp3 @claude
fix(memory): Fix XDS memory leak in rcwt_loop path
d72646a 
Add proper cleanup of xds_ctx in rcwt_loop() for --in=bin and --in=raw
formats. The general_loop() path already frees xds_ctx, but rcwt_loop()
was missing this cleanup, causing an 880-byte leak.

This fixes Valgrind tests 217 (--in=bin) and 218 (--in=raw).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
@cfsmp3 @claude
fix(rust): Fix Drop compatibility and formatting issues
4429067 
- demux.rs: Update dummy_demuxer() to explicitly initialize all fields
  instead of using ..Default::default(), which is not allowed when the
  struct implements Drop
- common.rs, demuxer.rs: Apply cargo fmt formatting fixes

This fixes the Rust test compilation error:
"cannot move out of type CcxDemuxer which implements the Drop trait"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
@cfsmp3 @claude
fix(rust): Remove unused import free_rust_c_string_array
859741a 
This fixes the clippy error: "unused import: crate::utils::free_rust_c_string_array"

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
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ccextractor-bot commented Dec 18, 2025

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results, when compared to test for commit 588ad52...:
Report Name Tests Passed
Broken 13/13
CEA-708 8/14
DVB 7/7
DVD 3/3
DVR-MS 2/2
General 27/27
Hardsubx 0/1
Hauppage 3/3
MP4 3/3
NoCC 10/10
Options 85/86
Teletext 17/21
WTV 13/13
XDS 34/34

Your PR breaks these cases:

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  • ccextractor --autoprogram --out=srt --latin1 --teletext --tpage 398 3b276ad8bf...

NOTE: The following tests have been failing on the master branch as well as the PR:

Congratulations: Merging this PR would fix the following tests:

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It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Check the result page for more info.

@cfsmp3 cfsmp3 merged commit a0809ca into master Dec 18, 2025
29 of 31 checks passed
@cfsmp3 cfsmp3 deleted the fix/valgrind-memory-issues branch December 18, 2025 08:16
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ccextractor-bot commented Dec 18, 2025

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results, when compared to test for commit 588ad52...:
Report Name Tests Passed
Broken 13/13
CEA-708 8/14
DVB 7/7
DVD 3/3
DVR-MS 2/2
General 27/27
Hardsubx 0/1
Hauppage 3/3
MP4 3/3
NoCC 10/10
Options 77/86
Teletext 17/21
WTV 12/13
XDS 34/34

Your PR breaks these cases:

  • ccextractor --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
  • ccextractor --startcreditsnotbefore 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
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NOTE: The following tests have been failing on the master branch as well as the PR:

Congratulations: Merging this PR would fix the following tests:

  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 8e8229b88b..., Last passed: Never
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  • ccextractor --autoprogram --out=ttxt --latin1 99e5eaafdc..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 b22260d065..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla 7aad20907e..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla c41f73056a..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla 5d3a29f9f8..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla 70000200c0..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla 6dc772d881..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla dab1c1bd65..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla adce82fd39..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla 15feae9133..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla 95dd33c6f1..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 01509e4d27..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla ab9cf8cfad..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 15feae9133..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --output-field 2 5d3a29f9f8..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --output-field 2 c41f73056a..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --sentencecap c032183ef0..., Last passed: Never
  • ccextractor --autoprogram --out=bin --latin1 c032183ef0..., Last passed: Never
  • ccextractor --hauppauge --autoprogram --out=srt --latin1 a03b5b2a56..., Last passed: Never
  • ccextractor --autoprogram --out=srt --hauppauge --latin1 553d78e755..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --hauppauge --ucla --latin1 553d78e755..., Last passed: Never
  • ccextractor --in=mp4 --out=srt --latin1 5df914ce77..., Last passed: Never
  • ccextractor --out=dvdraw c83f765c66..., Last passed: Never
  • ccextractor --out=txt c83f765c66..., Last passed: Never
  • ccextractor --out=ttxt c83f765c66..., Last passed: Never
  • ccextractor --out=spupng c83f765c66..., Last passed: Never
  • ccextractor --goptime c83f765c66..., Last passed: Never
  • ccextractor --unixts 5 --out=txt c83f765c66..., Last passed: Never
  • ccextractor --out=txt --datets c83f765c66..., Last passed: Never
  • ccextractor --out=txt --sects c83f765c66..., Last passed: Never
  • ccextractor --out=txt --lf c83f765c66..., Last passed: Never
  • ccextractor --in=es dc7169d7c4..., Last passed: Never
  • ccextractor --in=wtv b46e9e8e3f..., Last passed: Never
  • ccextractor --wtvmpeg2 10f0f77cf4..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 c0d2fba8c0..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 006fdc391a..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 e92a1d4d2a..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 b37ce60eb9..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 7e4ebf7fd7..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 9256a60e4b..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 27d7a43dd6..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 297a44921a..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 efbe129086..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 eae0077731..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 e2e2b501e0..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 c6407fb294..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --tpage 299 b8c55aa2e9..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 b236a0590b..., Last passed: Never
  • ccextractor --out=srt --latin1 f23a544ba8..., Last passed: Never
  • ccextractor --out=srt --latin1 97cc394d87..., Last passed: Never
  • ccextractor --out=srt --latin1 10f0f77cf4..., Last passed: Never
  • ccextractor --out=srt --latin1 df3b4d62d3..., Last passed: Never
  • ccextractor --out=srt --latin1 76734ac4a7..., Last passed: Never
  • ccextractor --out=srt --latin1 c791382c94..., Last passed: Never
  • ccextractor --out=srt --latin1 f673b2f916..., Last passed: Never
  • ccextractor --out=srt --latin1 da75bdee47..., Last passed: Never
  • ccextractor --out=srt --latin1 bd6f33a669..., Last passed: Never
  • ccextractor --out=srt --latin1 0e5e6b26be..., Last passed: Never
  • ccextractor --out=srt --latin1 a226cc302d..., Last passed: Never
  • ccextractor --out=srt --latin1 ae6327683e..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 725a49f871..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --xds --latin1 --ucla e274a73653..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla b22260d065..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --xds --ucla c813e713a0..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 27fab4dbb6..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 27fab4dbb6..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds bbd5bb52fc..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla bbd5bb52fc..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds b992e0cccb..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds d0291cdcf6..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla 7d2730d38e..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 7d2730d38e..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds c8dc039a88..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 53339f3455..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 83b03036a2..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7d3f25c32c..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 7d3f25c32c..., Last passed: Never
  • ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7f41299cc7..., Last passed: Never
  • ccextractor --autoprogram --out=srt --latin1 --ucla 7f41299cc7..., Last passed: Never

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Check the result page for more info.

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3 participants

@cfsmp3 @ccextractor-bot