X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fgif.c;h=e125d386bd2d2dda93278f47167dc6439890d3d8;hb=1ad6801a61da8aead9a9ba26933e9026b7be3646;hp=7916ba1e6b2a9bbaac3b08b6680e6218978d3ed3;hpb=398000abcf980d239a789da6f69811913d2fc635;p=ffmpeg

diff --git a/libavformat/gif.c b/libavformat/gif.c
index 7916ba1e6b2..e125d386bd2 100644
--- a/libavformat/gif.c
+++ b/libavformat/gif.c
@@ -174,6 +174,9 @@ static int gif_write_trailer(AVFormatContext *s)
     GIFContext *gif = s->priv_data;
     AVIOContext *pb = s->pb;
 
+    if (!gif->prev_pkt)
+        return AVERROR(EINVAL);
+
     gif_write_packet(s, NULL);
 
     if (!gif->have_end)