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avcodec/exr: Check ymin vs. h

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Fixes: out of array access
Fixes: 26532/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-5613925708857344
Fixes: 27443/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-5631239813595136

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
2020-10-24 22:21:48 +02:00
parent 1278f117d7
commit 3e5959b345
1 changed files with 1 additions and 1 deletions
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libavcodec/exr.c
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@@ -1830,7 +1830,7 @@ static int decode_frame(AVCodecContext *avctx, void *data,
// Zero out the start if ymin is not 0 // Zero out the start if ymin is not 0
for (i = 0; i < planes; i++) { for (i = 0; i < planes; i++) {
ptr = picture->data[i]; ptr = picture->data[i];
for (y = 0; y < s->ymin; y++) { for (y = 0; y < FFMIN(s->ymin, s->h); y++) {
memset(ptr, 0, out_line_size); memset(ptr, 0, out_line_size);
ptr += picture->linesize[i]; ptr += picture->linesize[i];
} }