---
libavformat/apngdec.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavformat/apngdec.c b/libavformat/apngdec.c
index dac71f1..e9c87a1 100644
--- a/libavformat/apngdec.c
+++ b/libavformat/apngdec.c
@@ -295,7 +295,9 @@ static int decode_fctl_chunk(AVFormatContext *s,
APNGDemuxContext *ctx, AVPacket
height != s->streams[0]->codec->height ||
x_offset != 0 ||
y_offset != 0) {
- if (sequence_number == 0)
+ if (sequence_number == 0 ||
+ width + x_offset > s->streams[0]->codec->width ||
+ height + y_offset > s->streams[0]->codec->height)
return AVERROR_INVALIDDATA;
ctx->is_key_frame = 0;
} else {
--
2.2.0.rc2.23.gca0107e
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