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| author |   Akria Fujita <a-fujita@rs.jp.nec.com> | 2013-02-01 20:52:46 -0500 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2013-02-01 20:52:46 -0500 |
| commit | 87e698734b9e618276c797092ccdd91da292d10e (patch) | |
| tree | cc78a0610c63ca864a44bb87e0059ce7ae4fea27 /fs/ext4/move_extent.c | |
| parent | ext4: use WARN in ext4_alloc_blocks (diff) | |
| download | wireguard-linux-87e698734b9e618276c797092ccdd91da292d10e.tar.xz wireguard-linux-87e698734b9e618276c797092ccdd91da292d10e.zip | |
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.c | 5 |
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; |