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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
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