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avcodec/webp: Fixes null pointer dereference

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Fixes: 1470/clusterfuzz-testcase-minimized-5404421666111488
Fixes: 1472/clusterfuzz-testcase-minimized-5677426430443520
Fixes: 1875/clusterfuzz-testcase-minimized-5536474562822144

Approved-by: BBB

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 67020711b7d45afa073ef671f755765035a64373)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-10 18:37:50 +02:00
parent 228093ec93
commit f88fd9027c
1 changed files with 3 additions and 0 deletions
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3
libavcodec/webp.c
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@ -1350,6 +1350,9 @@ static int vp8_lossy_decode_frame(AVCodecContext *avctx, AVFrame *p,
if (ret < 0)
return ret;
if (!*got_frame)
return AVERROR_INVALIDDATA;
update_canvas_size(avctx, avctx->width, avctx->height);
if (s->has_alpha) {