[FFmpeg-cvslog] avidec: Check return value of more avio_seek calls

[Joakim Plate]

ffmpeg | branch: release/0.8 | Joakim Plate <elupus at ecce.se> | Mon Sep 12 04:07:36 2011 +0200| [4a721b18edfdea44643ff9bb6ed80ee176e71f1b] | committer: Michael Niedermayer

avidec: Check return value of more avio_seek calls

The move of avio_seek in avi_read_seek is to avoiding modifying
state if the seek would fail.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit f9e083a156f19094cb6fcd134c1ca4ca899a1a6d)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4a721b18edfdea44643ff9bb6ed80ee176e71f1b
---

 libavformat/avidec.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index 80620da..6fedaf7 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -220,13 +220,18 @@ static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
                 return -1;
             }
 
-            avio_seek(pb, offset+8, SEEK_SET);
+            if(avio_seek(pb, offset+8, SEEK_SET) < 0)
+                return -1;
             avi->odml_depth++;
             read_braindead_odml_indx(s, frame_num);
             avi->odml_depth--;
             frame_num += duration;
 
-            avio_seek(pb, pos, SEEK_SET);
+            if(avio_seek(pb, pos, SEEK_SET) < 0) {
+                av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index");
+                return -1;
+            }
+
         }
     }
     avi->index_loaded=1;
@@ -1325,11 +1330,13 @@ static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp
         /* the av_index_search_timestamp call above.                     */
         assert(stream_index == 0);
 
+        if(avio_seek(s->pb, pos, SEEK_SET) < 0)
+            return -1;
+
         /* Feed the DV video stream version of the timestamp to the */
         /* DV demux so it can synthesize correct timestamps.        */
         dv_offset_reset(avi->dv_demux, timestamp);
 
-        avio_seek(s->pb, pos, SEEK_SET);
         avi->stream_index= -1;
         return 0;
     }
@@ -1380,7 +1387,8 @@ static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp
     }
 
     /* do the seek */
-    avio_seek(s->pb, pos_min, SEEK_SET);
+    if (avio_seek(s->pb, pos_min, SEEK_SET) < 0)
+        return -1;
     avi->stream_index= -1;
     return 0;
 }