forked from FFmpeg/FFmpeg
avcodec/pngdec: Check last AVFrame before deref
Fixes: NULL pointer dereference Fixes: 68184/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APNG_fuzzer-4926478069334016 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -1218,7 +1218,7 @@ static int decode_fctl_chunk(AVCodecContext *avctx, PNGDecContext *s,
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return AVERROR_INVALIDDATA;
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}
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if ((sequence_number == 0 || !s->last_picture.f->data[0]) &&
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if ((sequence_number == 0 || !s->last_picture.f) &&
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dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
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// No previous frame to revert to for the first frame
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// Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
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