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avcodec/iff: Check length before memcpy() in decode_deep_rle32()

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Fixes: out of array read
Fixes: 20796/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5111364702175232.fuzz

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 b4a33387cb)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-04-21 00:03:40 +02:00
parent fac6bc92f7
commit fc559ce561
1 changed files with 2 additions and 0 deletions
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2
libavcodec/iff.c
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@ -722,6 +722,8 @@ static void decode_deep_rle32(uint8_t *dst, const uint8_t *src, int src_size, in
int size = opcode + 1;
for (i = 0; i < size; i++) {
int length = FFMIN(size - i, width);
if (src_end - src < length * 4)
return;
memcpy(dst + y*linesize + x * 4, src, length * 4);
src += length * 4;
x += length;