From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Chris Mason" Date: Tue, 08 Jul 2014 20:01:50 +0100 Message-ID: Subject: [PATCH 3.2 071/125] Btrfs: fix double free in find_lock_delalloc_range In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.2.61-rc1 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: Ben Hutchings --- fs/btrfs/extent_io.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -1523,6 +1523,7 @@ 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;