[FFmpeg-cvslog] avcodec/lpc: signed integer overflow in compute_lpc_coefs() (aacdec_fixed)

[Michael Niedermayer]

ffmpeg | branch: release/3.1 | Michael Niedermayer <michael at niedermayer.cc> | Thu Jun 15 01:35:49 2017 +0200| [feefeb4df1c18603508b87659fa4d423212d2c60] | committer: Michael Niedermayer

avcodec/lpc: signed integer overflow in compute_lpc_coefs() (aacdec_fixed)

Fixes: runtime error: signed integer overflow: -1575818955 + -915383657 cannot be represented in type 'int'
Fixes: 2224/clusterfuzz-testcase-minimized-6208559949807616

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 e95fcfe8fb28fdfdaecec465c60aad79bc340a3d)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=feefeb4df1c18603508b87659fa4d423212d2c60
---

 libavcodec/lpc.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libavcodec/lpc.h b/libavcodec/lpc.h
index edb1a6bc7d..704ffa9d4b 100644
--- a/libavcodec/lpc.h
+++ b/libavcodec/lpc.h
@@ -117,11 +117,14 @@ void ff_lpc_end(LPCContext *s);
 
 #if USE_FIXED
 typedef int LPC_TYPE;
+typedef unsigned LPC_TYPE_U;
 #else
 #ifdef LPC_USE_DOUBLE
 typedef double LPC_TYPE;
+typedef double LPC_TYPE_U;
 #else
 typedef float LPC_TYPE;
+typedef float LPC_TYPE_U;
 #endif
 #endif // USE_FIXED
 
@@ -192,8 +195,8 @@ static inline int AAC_RENAME(compute_lpc_coefs)(const LPC_TYPE *autoc, int max_o
         for(j=0; j < (i+1)>>1; j++) {
             LPC_TYPE f = lpc_last[    j];
             LPC_TYPE b = lpc_last[i-1-j];
-            lpc[    j] = f + AAC_MUL26(r, b);
-            lpc[i-1-j] = b + AAC_MUL26(r, f);
+            lpc[    j] = f + (LPC_TYPE_U)AAC_MUL26(r, b);
+            lpc[i-1-j] = b + (LPC_TYPE_U)AAC_MUL26(r, f);
         }
 
         if (fail && err < 0)