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avcodec/parser: ensure input padding is zeroed

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Fixes use of uninitialized value, reported by MSAN.

Found by OSS-Fuzz.

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>

Fixes: 70852/clusterfuzz-testcase-minimized-ffmpeg_IO_DEMUXER_fuzzer-5179190066872320
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 5dfc0cc841)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Kacper Michajłow 2024-06-27 02:40:35 +02:00 • committed by Michael Niedermayer
parent fd1b4e5b09
commit 7475b2df34
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libavcodec/parser.c
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@ -271,6 +271,7 @@ int ff_combine_frame(ParseContext *pc, int next,
}
pc->buffer = new_buffer;
memcpy(&pc->buffer[pc->index], *buf, *buf_size);
memset(&pc->buffer[pc->index + *buf_size], 0, AV_INPUT_BUFFER_PADDING_SIZE);
pc->index += *buf_size;
return -1;
}