[FFmpeg-cvslog] sanm: Check dimensions before use
Michael Niedermayer
git at videolan.org
Tue May 7 22:04:34 CEST 2013
ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Tue May 7 21:58:27 2013 +0200| [9dd04f6d8cdd1c10c28b2cb4252c1a41df581915] | committer: Michael Niedermayer
sanm: Check dimensions before use
Fixes integer overflow and out of array accesses
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9dd04f6d8cdd1c10c28b2cb4252c1a41df581915
---
libavcodec/sanm.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index f217ef3..e6e866e 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -732,6 +732,11 @@ static int process_frame_obj(SANMVideoContext *ctx)
w = bytestream2_get_le16u(&ctx->gb);
h = bytestream2_get_le16u(&ctx->gb);
+ if (!w || !h) {
+ av_log(ctx->avctx, AV_LOG_ERROR, "dimensions are invalid\n");
+ return AVERROR_INVALIDDATA;
+ }
+
if (ctx->width < left + w || ctx->height < top + h) {
if (av_image_check_size(FFMAX(left + w, ctx->width),
FFMAX(top + h, ctx->height), 0, ctx->avctx) < 0)
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