[FFmpeg-cvslog] avcodec/rangecoder: Check e

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michael at niedermayer.cc> | Fri Sep 25 14:26:14 2015 +0200| [b5b29b22c0f8b49db045edb33254291486cb0db7] | committer: Michael Niedermayer

avcodec/rangecoder: Check e

Fixes hang.nut

Found-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit b2955b6c5aed11026ec5c7164462899a10cdb937)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b5b29b22c0f8b49db045edb33254291486cb0db7
---

 libavcodec/ffv1dec.c |    5 ++++-
 libavcodec/snow.h    |    2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index 760d74f..26ed2ee 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -47,8 +47,11 @@ static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,
     else {
         int i, e, a;
         e = 0;
-        while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10
+        while (get_rac(c, state + 1 + FFMIN(e, 9))) { // 1..10
             e++;
+            if (e > 31)
+                return AVERROR_INVALIDDATA;
+        }
 
         a = 1;
         for (i = e - 1; i >= 0; i--)
diff --git a/libavcodec/snow.h b/libavcodec/snow.h
index 46df46c..d2fcc7c 100644
--- a/libavcodec/snow.h
+++ b/libavcodec/snow.h
@@ -555,6 +555,8 @@ static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){
         e= 0;
         while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10
             e++;
+            if (e > 31)
+                return AVERROR_INVALIDDATA;
         }
 
         a= 1;