[FFmpeg-cvslog] h264_cabac: Break infinite loops

[Michael Niedermayer]

ffmpeg | branch: release/1.1 | Michael Niedermayer <michaelni at gmx.at> | Thu Jan 31 04:20:24 2013 +0100| [eb1aa871d4ef9fc11484de436fa02c352b1b7cac] | committer: Vittorio Giovara

h264_cabac: Break infinite loops

This fixes out of array reads and/or infinite loops.

30 is the maximum number of bits that can be read into
coeff_abs below.

CC: libav-stable at libav.org
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Martin Storsjö <martin at martin.st>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=eb1aa871d4ef9fc11484de436fa02c352b1b7cac
---

 libavcodec/h264_cabac.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/h264_cabac.c b/libavcodec/h264_cabac.c
index 92c1c03..a8063bd 100644
--- a/libavcodec/h264_cabac.c
+++ b/libavcodec/h264_cabac.c
@@ -1713,7 +1713,7 @@ decode_cabac_residual_internal(H264Context *h, DCTELEM *block,
 \
             if( coeff_abs >= 15 ) { \
                 int j = 0; \
-                while( get_cabac_bypass( CC ) ) { \
+                while (get_cabac_bypass(CC) && j < 30) { \
                     j++; \
                 } \
 \