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avcodec/cbs_jpeg: Check length for SOS

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Fixes: out of array access
Fixes: 19734/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5673507031875584
Fixes: 19353/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5703944462663680

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-03-07 15:42:58 +01:00
parent 0a11ef68f0
commit 1812352d76
1 changed files with 3 additions and 0 deletions
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3
libavcodec/cbs_jpeg.c
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@ -197,6 +197,9 @@ static int cbs_jpeg_split_fragment(CodedBitstreamContext *ctx,
if (marker == JPEG_MARKER_SOS) {
length = AV_RB16(frag->data + start);
if (length > end - start)
return AVERROR_INVALIDDATA;
data_ref = NULL;
data = av_malloc(end - start +
AV_INPUT_BUFFER_PADDING_SIZE);