lkml.org 
[lkml]   [2019]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] btrfs: fix a NULL pointer dereference
Date
btrfs_lookup_block_group may fail and return NULL. The fix goes
to out when it fails to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
fs/btrfs/extent-tree.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 994f0cc41799..b1e7985bcb9d 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7303,6 +7303,8 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,

pin = 0;
cache = btrfs_lookup_block_group(fs_info, buf->start);
+ if (!cache)
+ goto out;

if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
pin_down_extent(fs_info, cache, buf->start,
--
2.17.1
\
 
 \ /
  Last update: 2019-03-14 08:51    [W:0.087 / U:0.092 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site