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avformat/vqf: Ensure that comm_chunk is fully read

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Fixes: use of uninitialized memory
Fixes: 412125811/clusterfuzz-testcase-minimized-ffmpeg_dem_VQF_fuzzer-6253774274887680

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 1b7a327b3a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2025-07-23 13:36:42 +02:00
parent 4e196c9128
commit 1865bc93fc
1 changed files with 4 additions and 1 deletions
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5
libavformat/vqf.c
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@@ -20,6 +20,7 @@
*/
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
@@ -141,7 +142,9 @@ static int vqf_read_header(AVFormatContext *s)
if (len < 12)
return AVERROR_INVALIDDATA;
avio_read(s->pb, comm_chunk, 12);
ret = ffio_read_size(s->pb, comm_chunk, 12);
if (ret < 0)
return ret;
st->codecpar->ch_layout.nb_channels = AV_RB32(comm_chunk) + 1;
read_bitrate = AV_RB32(comm_chunk + 4);
rate_flag = AV_RB32(comm_chunk + 8);