[FFmpeg-cvslog] avcodec/msvideo1: Check side data size before use

[Michael Niedermayer]

ffmpeg | branch: release/3.0 | Michael Niedermayer <michael at niedermayer.cc> | Sun Oct 30 15:12:12 2016 +0100| [7affe32738d84c4c47ece7ad1835ae733220751d] | committer: Michael Niedermayer

avcodec/msvideo1: Check side data size before use

Fixes out of array read

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 161ccdaa06d1d109e8f77d2535bda11ce02720f5)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7affe32738d84c4c47ece7ad1835ae733220751d
---

 libavcodec/msvideo1.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libavcodec/msvideo1.c b/libavcodec/msvideo1.c
index 891675f..0526505 100644
--- a/libavcodec/msvideo1.c
+++ b/libavcodec/msvideo1.c
@@ -306,11 +306,14 @@ static int msvideo1_decode_frame(AVCodecContext *avctx,
         return ret;
 
     if (s->mode_8bit) {
-        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+        int size;
+        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
 
-        if (pal) {
+        if (pal && size == AVPALETTE_SIZE) {
             memcpy(s->pal, pal, AVPALETTE_SIZE);
             s->frame->palette_has_changed = 1;
+        } else if (pal) {
+            av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
         }
     }