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avcodec/rasc: Check frame before clearing

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Fixes: null pointer dereference
Fixes: 27737/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RASC_fuzzer-5769028685266944

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 380a3a0adf)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-12-03 23:41:10 +01:00
parent 7ce729649f
commit 6b0eacc1c2
1 changed files with 3 additions and 0 deletions
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3
libavcodec/rasc.c
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@ -70,6 +70,9 @@ static void clear_plane(AVCodecContext *avctx, AVFrame *frame)
RASCContext *s = avctx->priv_data;
uint8_t *dst = frame->data[0];
if (!dst)
return;
for (int y = 0; y < avctx->height; y++) {
memset(dst, 0, avctx->width * s->bpp);
dst += frame->linesize[0];