[FFmpeg-devel] [PATCH] Check for invalid slice offsets in real decoder.

[fenrir at elivagar.org]

From: Laurent Aimar <fenrir at videolan.org>

---
 libavcodec/rv34.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/libavcodec/rv34.c b/libavcodec/rv34.c
index 8223e92..a760e5e 100644
--- a/libavcodec/rv34.c
+++ b/libavcodec/rv34.c
@@ -1488,8 +1488,9 @@ int ff_rv34_decode_frame(AVCodecContext *avctx,
         slice_count = avctx->slice_count;
 
     //parse first slice header to check whether this frame can be decoded
-    if(get_slice_offset(avctx, slices_hdr, 0) > buf_size){
-        av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");
+    if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||
+       get_slice_offset(avctx, slices_hdr, 0) > buf_size){
+        av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
         return -1;
     }
     init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), (buf_size-get_slice_offset(avctx, slices_hdr, 0))*8);
@@ -1512,8 +1513,8 @@ int ff_rv34_decode_frame(AVCodecContext *avctx,
         else
             size = get_slice_offset(avctx, slices_hdr, i+1) - offset;
 
-        if(offset > buf_size){
-            av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");
+        if(offset < 0 || offset > buf_size || size < 0){
+            av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
             break;
         }
 
-- 
1.7.2.5