From: Dmitry Monakhov <dmonakhov@openvz.org>
Date: Sun, 13 Apr 2014 19:05:42 +0000 (-0400)
Subject: ext4: fix error handling in ext4_ext_shift_extents
X-Git-Tag: v5.15~18014^2~13
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8dc79ec4c0537e1b83c0739af82a7babefb30012;p=platform%2Fkernel%2Flinux-starfive.git

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 @@ ext4_ext_shift_extents(struct inode *inode, handle_t *handle,
 	 * 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);