From 10eabb8e40df0ad84470d750f903917f4a05cb1f Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 25 Oct 2019 12:44:45 +0200 Subject: [PATCH] avcodec/interplayacm: Fix overflow of last unused value Fixes: signed integer overflow: -2147450880 - 65535 cannot be represented in type 'int' Fixes: 18393/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_INTERPLAY_ACM_fuzzer-5667520110919680 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/interplayacm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/interplayacm.c b/libavcodec/interplayacm.c index cff79eb6b2..3704d1a2f2 100644 --- a/libavcodec/interplayacm.c +++ b/libavcodec/interplayacm.c @@ -529,7 +529,7 @@ static int decode_block(InterplayACMContext *s) for (i = 1, x = -val; i <= count; i++) { s->midbuf[-i] = x; - x -= val; + x -= (unsigned)val; } ret = fill_block(s);