[FFmpeg-cvslog] avcodec/msrle: Check side data size before use
Michael Niedermayer
git at videolan.org
Sat Nov 26 16:47:54 EET 2016
ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sun Oct 30 15:12:12 2016 +0100| [f39522b6e75deab0285510f87b4868da69063d10] | committer: Michael Niedermayer
avcodec/msrle: Check side data size before use
Fixes out of array read
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit a6330119a099840c5279697cf80cb768df97a90a)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f39522b6e75deab0285510f87b4868da69063d10
---
libavcodec/msrle.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/libavcodec/msrle.c b/libavcodec/msrle.c
index df9f795..4032d08 100644
--- a/libavcodec/msrle.c
+++ b/libavcodec/msrle.c
@@ -99,11 +99,14 @@ static int msrle_decode_frame(AVCodecContext *avctx,
return ret;
if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) {
- 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) {
s->frame->palette_has_changed = 1;
memcpy(s->pal, pal, AVPALETTE_SIZE);
+ } else if (pal) {
+ av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
}
/* make the palette available */
memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
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