Prevent overflow in CheckBufferFull

adamreeve · adamreeve · commit d5bf9fbfdd7c · 2025-10-31T14:09:15.000+13:00
diff --git a/cpp/src/arrow/util/rle_encoding_internal.h b/cpp/src/arrow/util/rle_encoding_internal.h
@@ -1423,7 +1423,7 @@ inline int RleBitPackedEncoder::Flush() {
 }
 
 inline void RleBitPackedEncoder::CheckBufferFull() {
-  int bytes_written = bit_writer_.bytes_written();
+  int64_t bytes_written = bit_writer_.bytes_written();
   if (bytes_written + max_run_byte_size_ > bit_writer_.buffer_len()) {
     buffer_full_ = true;
   }

Original file line number	Diff line number	Diff line change
`@@ -1423,7 +1423,7 @@ inline int RleBitPackedEncoder::Flush() {`
`1423`	`1423`	`}`
`1424`	`1424`
`1425`	`1425`	`inline void RleBitPackedEncoder::CheckBufferFull() {`
`1426`		`- int bytes_written = bit_writer_.bytes_written();`
	`1426`	`+ int64_t bytes_written = bit_writer_.bytes_written();`
`1427`	`1427`	`if (bytes_written + max_run_byte_size_ > bit_writer_.buffer_len()) {`
`1428`	`1428`	`buffer_full_ = true;`
`1429`	`1429`	`}`