From 9d3ddef519e88c40c05be8cb94cd9e71c0957ec7 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 2 Sep 2019 22:44:50 +0200 Subject: [PATCH] avcodec/apedec: Fix 32bit int overflow in do_apply_filter() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fixes: signed integer overflow: 2147480546 + 4096 cannot be represented in type 'int' Fixes: 16280/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5123442566758400 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Tomas Härdin Signed-off-by: Michael Niedermayer --- libavcodec/apedec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c index 490b11b94e..ed22f0f019 100644 --- a/libavcodec/apedec.c +++ b/libavcodec/apedec.c @@ -1266,7 +1266,7 @@ static void do_apply_filter(APEContext *ctx, int version, APEFilter *f, f->delay - order, f->adaptcoeffs - order, order, APESIGN(*data)); - res = (res + (1 << (fracbits - 1))) >> fracbits; + res = (int)(res + (1U << (fracbits - 1))) >> fracbits; res += *data; *data++ = res;