[FFmpeg-cvslog] avformat/gifdec: Check ffio_ensure_seekback()

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Wed May 22 06:49:43 2024 +0200| [590fffe6adcfdc13e6f520a47be0ece72fe0707d] | committer: Andreas Rheinhardt

avformat/gifdec: Check ffio_ensure_seekback()

Fixes Coverity issue #1598400.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=590fffe6adcfdc13e6f520a47be0ece72fe0707d
---

 libavformat/gifdec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/gifdec.c b/libavformat/gifdec.c
index 294007682b..d5f06adc64 100644
--- a/libavformat/gifdec.c
+++ b/libavformat/gifdec.c
@@ -85,7 +85,10 @@ static int gif_probe(const AVProbeData *p)
 
 static int resync(AVIOContext *pb)
 {
-    ffio_ensure_seekback(pb, 13);
+    int ret = ffio_ensure_seekback(pb, 13);
+    if (ret < 0)
+        return ret;
+
     for (int i = 0; i < 6; i++) {
         int b = avio_r8(pb);
         if (b != gif87a_sig[i] && b != gif89a_sig[i])