[libav-stable] xxan: Disallow odd width

Martin Storsjö git at libav.org
Sun Sep 29 19:07:52 CEST 2013


Module: libav
Branch: master
Commit: aa0dd52434768da64f1f3d8ae92bcf980c1adffc

Author:    Martin Storsjö <martin at martin.st>
Committer: Martin Storsjö <martin at martin.st>
Date:      Sun Sep 29 01:04:05 2013 +0300

xxan: Disallow odd width

Decoded data is always written in pairs within this decoder.
This fixes writes out of bounds.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable at libav.org
Signed-off-by: Martin Storsjö <martin at martin.st>

---

 libavcodec/xxan.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/xxan.c b/libavcodec/xxan.c
index 2bc9ff6..05ce7ff 100644
--- a/libavcodec/xxan.c
+++ b/libavcodec/xxan.c
@@ -50,6 +50,10 @@ static av_cold int xan_decode_init(AVCodecContext *avctx)
         av_log(avctx, AV_LOG_ERROR, "Invalid frame height: %d.\n", avctx->height);
         return AVERROR(EINVAL);
     }
+    if (avctx->width & 1) {
+        av_log(avctx, AV_LOG_ERROR, "Invalid frame width: %d.\n", avctx->width);
+        return AVERROR(EINVAL);
+    }
 
     s->buffer_size = avctx->width * avctx->height;
     s->y_buffer = av_malloc(s->buffer_size);



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