[FFmpeg-cvslog] avcodec/ffv1dec: Explicitly check read_quant_table() return value

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sat Sep 26 13:09:59 2015 +0200| [97340bdfa3913f991960060a18824ea7df4fc081] | committer: Michael Niedermayer

avcodec/ffv1dec: Explicitly check read_quant_table() return value

Forwards the error code, avoids potential integer overflow

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 10bbf6cf622f8a954c6cc694ca07c24f989c99af)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=97340bdfa3913f991960060a18824ea7df4fc081
---

 libavcodec/ffv1dec.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index e68f3d2..93d728a 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -502,7 +502,10 @@ static int read_quant_tables(RangeCoder *c,
     int context_count = 1;
 
     for (i = 0; i < 5; i++) {
-        context_count *= read_quant_table(c, quant_table[i], context_count);
+        int ret = read_quant_table(c, quant_table[i], context_count);
+        if (ret < 0)
+            return ret;
+        context_count *= ret;
         if (context_count > 32768U) {
             return AVERROR_INVALIDDATA;
         }