[FFmpeg-devel] [PATCH 4/5] avcodec/eac3dec: Fix runtime error: left shift of negative value -3

[Michael Niedermayer]

Fixes: 672/clusterfuzz-testcase-5595018867769344

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/eac3dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/eac3dec.c b/libavcodec/eac3dec.c
index be2350237e..c971879b2d 100644
--- a/libavcodec/eac3dec.c
+++ b/libavcodec/eac3dec.c
@@ -280,7 +280,7 @@ static void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch)
                     mant += ((ff_eac3_gaq_remap_2_4_a[hebap-8][log_gain-1] * (int64_t)mant) >> 15) + b;
                 } else {
                     /* small mantissa, no GAQ, or Gk=1 */
-                    mant <<= 24 - bits;
+                    mant *= (1 << 24 - bits);
                     if (!log_gain) {
                         /* remap mantissa value for no GAQ or Gk=1 */
                         mant += (ff_eac3_gaq_remap_1[hebap-8] * (int64_t)mant) >> 15;
-- 
2.11.0