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avformat/wtvdec: Initialize buf

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ff_parse_mpeg2_descriptor() reads over what is initialized
Fixes: use of uninitialized memory
Fixes: 383825645/clusterfuzz-testcase-minimized-ffmpeg_dem_WTV_fuzzer-5144130618982400

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 17b019c517af26c6d2f0c6266938c60d36db1fa3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2024-12-26 02:53:45 +01:00
parent 884c833434
commit 15498e7242
1 changed files with 1 additions and 1 deletions
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libavformat/wtvdec.c
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@ -832,7 +832,7 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0) {
AVStream *st = s->streams[stream_index];
uint8_t buf[258];
uint8_t buf[258] = {0};
const uint8_t *pbuf = buf;
int buf_size;