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authorAkria Fujita <a-fujita@rs.jp.nec.com>2013-02-01 20:52:46 -0500
committerTheodore Ts'o <tytso@mit.edu>2013-02-01 20:52:46 -0500
commit87e698734b9e618276c797092ccdd91da292d10e (patch)
treecc78a0610c63ca864a44bb87e0059ce7ae4fea27 /fs/ext4/move_extent.c
parent524c19ebc961799b1ec126e4b063b941a70275e5 (diff)
ext4: fix smatch warning in move_extent.c's mext_replace_branches()
Commit 2147b1a6a48 resulted in a new smatch warning: > fs/ext4/move_extent.c:693 mext_replace_branches() > warn: variable dereferenced before check 'dext' (see line 683) Fix this by adding a check to make sure dext is non-NULL before we derefrence it. Signed-off-by: Akria Fujita <a-fujita@rs.jp.nec.com> [ modified by tytso to make sure an ext4_error is called ] Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/move_extent.c')
-rw-r--r--fs/ext4/move_extent.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index d9cc5ee42f53..e4cdb5188f34 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -681,6 +681,8 @@ mext_replace_branches(handle_t *handle, struct inode *orig_inode,
depth = ext_depth(donor_inode);
dext = donor_path[depth].p_ext;
+ if (unlikely(!dext))
+ goto missing_donor_extent;
tmp_dext = *dext;
*err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off,
@@ -691,7 +693,8 @@ mext_replace_branches(handle_t *handle, struct inode *orig_inode,
/* Loop for the donor extents */
while (1) {
/* The extent for donor must be found. */
- if (!dext) {
+ if (unlikely(!dext)) {
+ missing_donor_extent:
EXT4_ERROR_INODE(donor_inode,
"The extent for donor must be found");
*err = -EIO;