This fixes a segmentation fault caused by calling memcpy with NULL as
second argument in handle_p_frame_apng.
Signed-off-by: Andreas Cadhalpun <andreas.cadhal...@googlemail.com>
---
libavcodec/pngdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 36275ae..a7b330b 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -922,7 +922,7 @@ static int decode_fctl_chunk(AVCodecContext *avctx,
PNGDecContext *s,
return AVERROR_INVALIDDATA;
}
- if (sequence_number == 0 && dispose_op == APNG_DISPOSE_OP_PREVIOUS) {
+ if (!s->previous_picture.f->data[0] && dispose_op ==
APNG_DISPOSE_OP_PREVIOUS) {
// No previous frame to revert to for the first frame
// Spec says to just treat it as a APNG_DISPOSE_OP_BACKGROUND
dispose_op = APNG_DISPOSE_OP_BACKGROUND;
--
2.10.2
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