From 98cc9efc5f6b4dc847ed3b9b60b1c3bcd14e6791 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Thu, 28 Nov 2013 10:54:35 +0100 Subject: [PATCH] h264: prevent two matching fields from being both a short/long ref combination Fixes possible access to freed memory. Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind CC:libav-stable@libav.org --- libavcodec/h264_refs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavcodec/h264_refs.c b/libavcodec/h264_refs.c index bba77d15b0..88aaac7e1b 100644 --- a/libavcodec/h264_refs.c +++ b/libavcodec/h264_refs.c @@ -621,6 +621,8 @@ int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count) * Report the problem and keep the pair where it is, * and mark this field valid. */ + if (h->short_ref[0] == h->cur_pic_ptr) + remove_short_at_index(h, 0); if (h->long_ref[mmco[i].long_arg] != h->cur_pic_ptr) { remove_long(h, mmco[i].long_arg, 0);