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

[Andreas Cadhalpun]

ffmpeg | branch: release/2.5 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Fri Jul  3 00:01:56 2015 +0200| [29a97823ba7c534d88ff414394a85f6d36ab6434] | 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=29a97823ba7c534d88ff414394a85f6d36ab6434
---

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

diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c
index e6e3476..ee4eb03 100644
--- a/libavcodec/wmalosslessdec.c
+++ b/libavcodec/wmalosslessdec.c
@@ -486,7 +486,7 @@ 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++)