From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chris Mason Subject: [PATCH 3.10 63/77] Btrfs: fix double free in find_lock_delalloc_range Date: Sat, 28 Jun 2014 10:46:56 -0700 Message-Id: <20140628174524.889141371@linuxfoundation.org> In-Reply-To: <20140628174521.691276402@linuxfoundation.org> References: <20140628174521.691276402@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chris Mason commit 7d78874273463a784759916fc3e0b4e2eb141c70 upstream. We need to NULL the cached_state after freeing it, otherwise we might free it again if find_delalloc_range doesn't find anything. Signed-off-by: Chris Mason Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/extent_io.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1624,6 +1624,7 @@ again: * shortening the size of the delalloc range we're searching */ free_extent_state(cached_state); + cached_state = NULL; if (!loops) { unsigned long offset = (*start) & (PAGE_CACHE_SIZE - 1); max_bytes = PAGE_CACHE_SIZE - offset;