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avcodec/iff: Fix off by x error

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Fixes: out of array access
Fixes: 23245/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5723121327013888.fuzz

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 2020-06-13 10:48:14 +02:00
parent 360be03b8a
commit 51225dee0a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/iff.c
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@ -723,7 +723,7 @@ static void decode_deep_rle32(uint8_t *dst, const uint8_t *src, int src_size, in
if (opcode >= 0) {
int size = opcode + 1;
for (i = 0; i < size; i++) {
int length = FFMIN(size - i, width);
int length = FFMIN(size - i, width - x);
if (src_end - src < length * 4)
return;
memcpy(dst + y*linesize + x * 4, src, length * 4);