ext4: fix error handling in ext4_ext_shift_extents
Fix error handling by adding some. :-)
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 96e0a4bc8..38be063 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5314,11 +5314,18 @@
* enough to accomodate the shift.
*/
path = ext4_ext_find_extent(inode, start - 1, NULL, 0);
+ if (IS_ERR(path))
+ return PTR_ERR(path);
depth = path->p_depth;
extent = path[depth].p_ext;
- ex_start = le32_to_cpu(extent->ee_block);
- ex_end = le32_to_cpu(extent->ee_block) +
+ if (extent) {
+ ex_start = le32_to_cpu(extent->ee_block);
+ ex_end = le32_to_cpu(extent->ee_block) +
ext4_ext_get_actual_len(extent);
+ } else {
+ ex_start = 0;
+ ex_end = 0;
+ }
ext4_ext_drop_refs(path);
kfree(path);