avformat/gifdec: Check ffio_ensure_seekback()

Fixes Coverity issue #1598400. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
7 months ago · 590fffe6ad
parent b47116be45
commit 590fffe6ad
1 changed files with 4 additions and 1 deletions
--- 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])