[FFmpeg-cvslog] avcodec/aacsbr_fixed: Fix division by zero in sbr_gain_calc()

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Wed Nov  1 14:00:19 2017 +0100| [92eff6b829bd005fdb27e44102623d5fd295d7d0] | committer: Michael Niedermayer

avcodec/aacsbr_fixed: Fix division by zero in sbr_gain_calc()

Fixes: 3642/clusterfuzz-testcase-minimized-5443853801750528

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 7d1dec466895eed12f2c79b7ab5447f5390fe869)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=92eff6b829bd005fdb27e44102623d5fd295d7d0
---

 libavcodec/aacsbr_fixed.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/aacsbr_fixed.c b/libavcodec/aacsbr_fixed.c
index a12ecd19c9..e245ed56ee 100644
--- a/libavcodec/aacsbr_fixed.c
+++ b/libavcodec/aacsbr_fixed.c
@@ -440,6 +440,7 @@ static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
                                                 av_add_sf(FLOAT_1, sbr->e_curr[e][m]),
                                                 av_add_sf(FLOAT_1, sbr->q_mapped[e][m]))));
                 }
+                sbr->gain[e][m] = av_add_sf(sbr->gain[e][m], FLOAT_MIN);
             }
             for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
                 sum[0] = av_add_sf(sum[0], sbr->e_origmapped[e][m]);