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Yang Yingliangaxboe
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io_uring: fix memleak in __io_sqe_files_update()
I got a memleak report when doing some fuzz test: BUG: memory leak unreferenced object 0xffff888113e02300 (size 488): comm "syz-executor401", pid 356, jiffies 4294809529 (age 11.954s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ a0 a4 ce 19 81 88 ff ff 60 ce 09 0d 81 88 ff ff ........`....... backtrace: [<00000000129a84ec>] kmem_cache_zalloc include/linux/slab.h:659 [inline] [<00000000129a84ec>] __alloc_file+0x25/0x310 fs/file_table.c:101 [<000000003050ad84>] alloc_empty_file+0x4f/0x120 fs/file_table.c:151 [<000000004d0a41a3>] alloc_file+0x5e/0x550 fs/file_table.c:193 [<000000002cb242f0>] alloc_file_pseudo+0x16a/0x240 fs/file_table.c:233 [<00000000046a4baa>] anon_inode_getfile fs/anon_inodes.c:91 [inline] [<00000000046a4baa>] anon_inode_getfile+0xac/0x1c0 fs/anon_inodes.c:74 [<0000000035beb745>] __do_sys_perf_event_open+0xd4a/0x2680 kernel/events/core.c:11720 [<0000000049009dc7>] do_syscall_64+0x56/0xa0 arch/x86/entry/common.c:359 [<00000000353731ca>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 BUG: memory leak unreferenced object 0xffff8881152dd5e0 (size 16): comm "syz-executor401", pid 356, jiffies 4294809529 (age 11.954s) hex dump (first 16 bytes): 01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<0000000074caa794>] kmem_cache_zalloc include/linux/slab.h:659 [inline] [<0000000074caa794>] lsm_file_alloc security/security.c:567 [inline] [<0000000074caa794>] security_file_alloc+0x32/0x160 security/security.c:1440 [<00000000c6745ea3>] __alloc_file+0xba/0x310 fs/file_table.c:106 [<000000003050ad84>] alloc_empty_file+0x4f/0x120 fs/file_table.c:151 [<000000004d0a41a3>] alloc_file+0x5e/0x550 fs/file_table.c:193 [<000000002cb242f0>] alloc_file_pseudo+0x16a/0x240 fs/file_table.c:233 [<00000000046a4baa>] anon_inode_getfile fs/anon_inodes.c:91 [inline] [<00000000046a4baa>] anon_inode_getfile+0xac/0x1c0 fs/anon_inodes.c:74 [<0000000035beb745>] __do_sys_perf_event_open+0xd4a/0x2680 kernel/events/core.c:11720 [<0000000049009dc7>] do_syscall_64+0x56/0xa0 arch/x86/entry/common.c:359 [<00000000353731ca>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 If io_sqe_file_register() failed, we need put the file that get by fget() to avoid the memleak. Fixes: c3a31e6 ("io_uring: add support for IORING_REGISTER_FILES_UPDATE") Cc: [email protected] Reported-by: Hulk Robot <[email protected]> Signed-off-by: Yang Yingliang <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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fs/io_uring.c

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6851,8 +6851,10 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
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}
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table->files[index] = file;
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err = io_sqe_file_register(ctx, file, i);
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if (err)
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if (err) {
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fput(file);
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break;
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}
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}
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nr_args--;
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done++;

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