avformat/oggparseogm: Check lb against psize

No testcase, this was found during code review Found-by: Matt Wolenetz <[email protected]> Reviewed-by: Matt Wolenetz <[email protected]> Signed-off-by: Michael Niedermayer <[email protected]>
SaschaVasarrhelyi · Mar 10, 2018 · 3e7c847 · 3e7c847
1 parent 010b7b3
commit 3e7c847
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/libavformat/oggparseogm.c b/libavformat/oggparseogm.c
@@ -176,6 +176,9 @@ ogm_packet(AVFormatContext *s, int idx)
         os->pflags |= AV_PKT_FLAG_KEY;
 
     lb = ((*p & 2) << 1) | ((*p >> 6) & 3);
+    if (os->psize < lb + 1)
+        return AVERROR_INVALIDDATA;
+
     os->pstart += lb + 1;
     os->psize -= lb + 1;