Messages in this thread Patch in this message | | | From | Kangjie Lu <> | Subject | [PATCH v2] btrfs: fix a NULL pointer dereference | Date | Thu, 14 Mar 2019 03:13:04 -0500 |
| |
btrfs_lookup_block_group may fail and return NULL. The fix uses assert to ensure cache is not NULL.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
--- V2: use assert as suggested by Nikolay Borisov <nborisov@suse.com> --- fs/btrfs/extent-tree.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 994f0cc41799..80d7c272d282 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -7303,6 +7303,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans, pin = 0; cache = btrfs_lookup_block_group(fs_info, buf->start); + ASSERT(cache); if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { pin_down_extent(fs_info, cache, buf->start, -- 2.17.1
| |