Messages in this thread Patch in this message | | | From | Kangjie Lu <> | Subject | [PATCH] btrfs: fix a NULL pointer dereference | Date | Thu, 14 Mar 2019 02:50:40 -0500 |
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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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