[FFmpeg-cvslog] avcodec/ffv1dec: Fix off by 1 error in quant_table_count check

[Michael Niedermayer]

ffmpeg | branch: release/2.6 | Michael Niedermayer <michael at niedermayer.cc> | Sat Sep 26 13:20:59 2015 +0200| [53f11a47a350d4361fb376c247d4b475c7ef4a83] | committer: Michael Niedermayer

avcodec/ffv1dec: Fix off by 1 error in quant_table_count check

Fixes: invalid_read.nut
Found-by: Paul B Mahol <onemda at gmail.com>

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 2d221d9e069e6269cb41f3678f2734800171d87b)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=53f11a47a350d4361fb376c247d4b475c7ef4a83
---

 libavcodec/ffv1dec.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index 6191505..694b63c 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -306,7 +306,7 @@ static int decode_slice_header(FFV1Context *f, FFV1Context *fs)
     for (i = 0; i < f->plane_count; i++) {
         PlaneContext * const p = &fs->plane[i];
         int idx = get_symbol(c, state, 0);
-        if (idx > (unsigned)f->quant_table_count) {
+        if (idx >= (unsigned)f->quant_table_count) {
             av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
             return -1;
         }