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[FFmpeg-devel,1/4] avcodec/ac3dec_fixed: Fix several invalid left shifts in scale_coefs()

Message ID 20200202001639.32084-1-michael@niedermayer.cc
State New
Headers show
Series [FFmpeg-devel,1/4] avcodec/ac3dec_fixed: Fix several invalid left shifts in scale_coefs()
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Commit Message

Michael Niedermayer Feb. 2, 2020, 12:16 a.m. UTC
Fixes: left shift of negative value -14336
Fixes: 20298/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AC3_FIXED_fuzzer-5675484201615360

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/ac3dec_fixed.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)
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Patch

diff --git a/libavcodec/ac3dec_fixed.c b/libavcodec/ac3dec_fixed.c
index bd66175d50..1e1edc8964 100644
--- a/libavcodec/ac3dec_fixed.c
+++ b/libavcodec/ac3dec_fixed.c
@@ -107,29 +107,30 @@  static void scale_coefs (
       }
     } else {
       shift = -shift;
+      mul <<= shift;
       for (i=0; i<len; i+=8) {
 
           temp = src[i] * mul;
           temp1 = src[i+1] * mul;
           temp2 = src[i+2] * mul;
 
-          dst[i] = temp << shift;
+          dst[i] = temp;
           temp3 = src[i+3] * mul;
 
-          dst[i+1] = temp1 << shift;
+          dst[i+1] = temp1;
           temp4 = src[i + 4] * mul;
-          dst[i+2] = temp2 << shift;
+          dst[i+2] = temp2;
 
           temp5 = src[i+5] * mul;
-          dst[i+3] = temp3 << shift;
+          dst[i+3] = temp3;
           temp6 = src[i+6] * mul;
 
-          dst[i+4] = temp4 << shift;
+          dst[i+4] = temp4;
           temp7 = src[i+7] * mul;
 
-          dst[i+5] = temp5 << shift;
-          dst[i+6] = temp6 << shift;
-          dst[i+7] = temp7 << shift;
+          dst[i+5] = temp5;
+          dst[i+6] = temp6;
+          dst[i+7] = temp7;
 
       }
     }