From 83c7803f55b3231faeb93c1a634399a70fae9480 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 14 Apr 2012 18:28:31 +0200 Subject: [PATCH] lagarith: check count before writing zeros. Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer --- libavcodec/lagarith.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libavcodec/lagarith.c b/libavcodec/lagarith.c index 22d427e159..7f47b75826 100644 --- a/libavcodec/lagarith.c +++ b/libavcodec/lagarith.c @@ -326,6 +326,10 @@ static int lag_decode_zero_run_line(LagarithContext *l, uint8_t *dst, output_zeros: if (l->zeros_rem) { count = FFMIN(l->zeros_rem, width - i); + if(end - dst < count) { + av_log(l->avctx, AV_LOG_ERROR, "too many zeros remaining\n"); + return AVERROR_INVALIDDATA; + } memset(dst, 0, count); l->zeros_rem -= count; dst += count;