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sysfs: fix i_mutex locking in sysfs_get_dentry()

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lookup_one_len_kern() should be called with the parent's i_mutex
locked.  Fix it.

Spotted by Eric W. Biederman.

Signed-off-by: Tejun Heo <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Cornelia Huck <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Tejun Heo 2007-08-20 21:36:29 +09:00 • committed by Greg Kroah-Hartman
commit 253280267a
1 changed files with 2 additions and 0 deletions
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2
fs/sysfs/dir.c
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@ -130,8 +130,10 @@ struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd)
/* look it up */
parent_dentry = dentry;
mutex_lock(&parent_dentry->d_inode->i_mutex);
dentry = lookup_one_len_kern(cur->s_name, parent_dentry,
strlen(cur->s_name));
mutex_unlock(&parent_dentry->d_inode->i_mutex);
dput(parent_dentry);
if (IS_ERR(dentry)) {