[FFmpeg-cvslog] wmalosslessdec: avoid reading 0 bits with get_bits

[Andreas Cadhalpun]

ffmpeg | branch: release/2.7 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Fri Jul  3 00:01:56 2015 +0200| [1ec0541ae05b40f7dfdba76fd3fce4c84d3eac31] | committer: Michael Niedermayer

wmalosslessdec: avoid reading 0 bits with get_bits

Reviewed-by: Michael Niedermayer <michaelni at gmx.at>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit f9020d514e9ed5043496a710b36daba1ab182e97)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1ec0541ae05b40f7dfdba76fd3fce4c84d3eac31
---

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

diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c
index 843ce90..8094db3 100644
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@@ -488,7 +488,7 @@ static int decode_cdlms(WmallDecodeCtx *s)
                 if ((1 << cbits) < s->cdlms[c][i].scaling + 1)
                     cbits++;
 
-                s->cdlms[c][i].bitsend = get_bits(&s->gb, cbits) + 2;
+                s->cdlms[c][i].bitsend = (cbits ? get_bits(&s->gb, cbits) : 0) + 2;
                 shift_l = 32 - s->cdlms[c][i].bitsend;
                 shift_r = 32 - s->cdlms[c][i].scaling - 2;
                 for (j = 0; j < s->cdlms[c][i].coefsend; j++)