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authorTejun Heo <htejun@gmail.com>2007-08-20 16:36:29 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-10-13 01:51:07 +0400
commit253280267a7f1ced0c434fb24b7bef92d7d22628 (patch)
tree8add8daefa3cf776daf7f042cb9341debafe54f1 /fs/sysfs
parent1359555eb77d240b7c1d7ee75bb07e89e89770e4 (diff)
downloadlinux-253280267a7f1ced0c434fb24b7bef92d7d22628.tar.xz
sysfs: fix i_mutex locking in sysfs_get_dentry()
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 <htejun@gmail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/dir.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index a0da2b05a754..54ca4bc02dcf 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -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)) {