[FFmpeg-cvslog] avcodec/aac_defines: Fix: runtime error: left shift of negative value -2

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun May 21 02:51:04 2017 +0200| [c3547dcbc326474745f02a618e01848a293f3f92] | committer: Michael Niedermayer

avcodec/aac_defines: Fix: runtime error: left shift of negative value -2

Fixes: 1716/clusterfuzz-testcase-minimized-4691012196761600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c3547dcbc326474745f02a618e01848a293f3f92
---

 libavcodec/aac_defines.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/aac_defines.h b/libavcodec/aac_defines.h
index c12dc2fab7..0ea667e77b 100644
--- a/libavcodec/aac_defines.h
+++ b/libavcodec/aac_defines.h
@@ -45,7 +45,7 @@ typedef int                 AAC_SIGNE;
 #define Q30(x)              (int)((x)*1073741824.0 + 0.5)
 #define Q31(x)              (int)((x)*2147483648.0 + 0.5)
 #define RANGE15(x)          x
-#define GET_GAIN(x, y)      (-(y) << (x)) + 1024
+#define GET_GAIN(x, y)      (-(y) * (1 << (x))) + 1024
 #define AAC_MUL16(x, y)     (int)(((int64_t)(x) * (y) + 0x8000) >> 16)
 #define AAC_MUL26(x, y)     (int)(((int64_t)(x) * (y) + 0x2000000) >> 26)
 #define AAC_MUL30(x, y)     (int)(((int64_t)(x) * (y) + 0x20000000) >> 30)