[FFmpeg-cvslog] avcodec/alsdec: Fix reading 0 mantisse bits

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Sep  8 22:02:44 2016 +0200| [037422178d7f1d0dd09e1ce424dd61a69e77668b] | committer: Michael Niedermayer

avcodec/alsdec: Fix reading 0 mantisse bits

Fixes assertion failure
Fixes: 848c24abc1721c9e3d1ba7bfee8d9fcc/asan_heap-oob_1d99eca_3709_567bba70d67e7d62714dcf56f26fb1da.mp4

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=037422178d7f1d0dd09e1ce424dd61a69e77668b
---

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

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 1bb71f5..8c4ff53 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1527,7 +1527,7 @@ static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
             if (!get_bits1(gb)) { //uncompressed
                 for (i = 0; i < frame_length; ++i) {
                     if (ctx->raw_samples[c][i] != 0) {
-                        raw_mantissa[c][i] = get_bits(gb, nbits[i]);
+                        raw_mantissa[c][i] = nbits[i] ? get_bits(gb, nbits[i]) : 0;
                     }
                 }
             } else { //compressed