msrledec: Check for overreads

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 53be37e368928e7f274e33ef8d118109da373c79)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 5 insertions, 1 deletions

diff --git a/libavcodec/msrledec.c b/libavcodec/msrledec.c
index db8de7032d..129f0e0bc0 100644
--- a/libavcodec/msrledec.c
+++ b/libavcodec/msrledec.c
@@ -140,7 +140,7 @@ static int msrle_decode_8_16_24_32(AVCodecContext *avctx, AVPicture *pic, int de
 
     output     = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
     output_end = pic->data[0] +  avctx->height      * pic->linesize[0];
-    while(src < data + srcsize) {
+    while(src + 1 < data + srcsize) {
         p1 = *src++;
         if(p1 == 0) { //Escape code
             p2 = *src++;
@@ -172,6 +172,10 @@ static int msrle_decode_8_16_24_32(AVCodecContext *avctx, AVPicture *pic, int de
                 src += p2 * (depth >> 3);
                 continue;
             }
+            if(data + srcsize - src < p2 * (depth >> 3)){
+                av_log(avctx, AV_LOG_ERROR, "Copy beyond input buffer\n");
+                return -1;
+            }
             if ((depth == 8) || (depth == 24)) {
                 for(i = 0; i < p2 * (depth >> 3); i++) {
                     *output++ = *src++;