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Btrfs: avoid NULL pointer deref in try_release_extent_buffer
author
Chris Mason
<chris.mason@oracle.com>
Mon, 22 Nov 2010 03:27:44 +0000
(22:27 -0500)
committer
Chris Mason
<chris.mason@oracle.com>
Mon, 22 Nov 2010 03:27:44 +0000
(22:27 -0500)
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 <chris.mason@oracle.com>
fs/btrfs/extent_io.c
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diff --git
a/fs/btrfs/extent_io.c
b/fs/btrfs/extent_io.c
index
f60aa3c
..
143d3f5
100644
(file)
--- 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;