[FFmpeg-cvslog] avcodec/lpc: check for zero err in normalization in compute_lpc_coefs()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon May 31 15:27:18 2021 +0200| [70874e024a6eae0f95bd8dd4b9b4367ffd937f41] | committer: Michael Niedermayer

avcodec/lpc: check for zero err in normalization in compute_lpc_coefs()

Fixes: floating point division by 0
Fixes: Ticket8213

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=70874e024a6eae0f95bd8dd4b9b4367ffd937f41
---

 libavcodec/lpc.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/lpc.h b/libavcodec/lpc.h
index 52170fd623..e1b41bfd9b 100644
--- a/libavcodec/lpc.h
+++ b/libavcodec/lpc.h
@@ -186,7 +186,8 @@ static inline int AAC_RENAME(compute_lpc_coefs)(const LPC_TYPE *autoc, int max_o
             for(j=0; j<i; j++)
                 r -= lpc_last[j] * autoc[i-j-1];
 
-            r /= err;
+            if (err)
+                r /= err;
             err *= FIXR(1.0) - (r * r);
         }