From 45f49bce99d008d6864a20324548f35936ba46fb Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Sun, 21 Nov 2010 22:27:44 -0500 Subject: [PATCH] Btrfs: avoid NULL pointer deref in try_release_extent_buffer If we fail to find a pointer in the radix tree, don't try to deref the NULL one we do have. Signed-off-by: Chris Mason --- fs/btrfs/extent_io.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index f60aa3c..143d3f5 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -3837,8 +3837,10 @@ int try_release_extent_buffer(struct extent_io_tree *tree, struct page *page) spin_lock(&tree->buffer_lock); eb = radix_tree_lookup(&tree->buffer, start >> PAGE_CACHE_SHIFT); - if (!eb) - goto out; + if (!eb) { + spin_unlock(&tree->buffer_lock); + return ret; + } if (test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { ret = 0; -- 2.7.4