[FFmpeg-cvslog] rv34: Check for invalid slice offsets

[Laurent Aimar]

ffmpeg | branch: release/0.8 | Laurent Aimar <fenrir at videolan.org> | Mon Sep 19 22:48:53 2011 +0200| [d805b8f454f57451277a052cc1bda49e6caf6cd7] | committer: Anton Khirnov

rv34: Check for invalid slice offsets

Signed-off-by: Martin Storsjö <martin at martin.st>
(cherry picked from commit 4cc7732386eb36661ed22d1200339b38a5fa60bc)

Signed-off-by: Anton Khirnov <anton at khirnov.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d805b8f454f57451277a052cc1bda49e6caf6cd7
---

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

diff --git a/libavcodec/rv34.c b/libavcodec/rv34.c
index 87fca5c..70c35ef 100644
--- a/libavcodec/rv34.c
+++ b/libavcodec/rv34.c
@@ -1441,8 +1441,9 @@ 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);
@@ -1465,8 +1466,8 @@ 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;
         }