From 87eb3749708c0eb2978f4812c7be2a4af667fdb7 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 25 Feb 2017 21:07:25 +0100 Subject: [PATCH] avcodec/eac3dec: Fix runtime error: left shift of negative value -3 Fixes: 672/clusterfuzz-testcase-5595018867769344 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg Reviewed-by: Paul B Mahol Signed-off-by: Michael Niedermayer --- 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;