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authorTejun Heo <htejun@gmail.com>2008-01-16 12:06:14 +0900
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-01-16 09:54:03 -0800
commite49452c67703d3647467d65275fb893589384fed (patch)
tree137d7dea836f16f4efc3c709981dee3d306aa757
parentcbd9c883696da72b2b1f03f909dbacc04bbf8b58 (diff)
sysfs: make sysfs_lookup() return ERR_PTR(-ENOENT) on failed lookup
sysfs tries to keep dcache a strict subset of sysfs_dirent tree by shooting down dentries when a node is removed, that is, no negative dentry for sysfs. However, the lookup function returned NULL and thus created negative dentries when the target node didn't exist. Make sysfs_lookup() return ERR_PTR(-ENOENT) on lookup failure. This fixes the NULL dereference bug in sysfs_get_dentry() discovered by bluetooth rfcomm device moving around. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/sysfs/dir.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 337162935d2..b197016bbfb 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -678,8 +678,10 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
sd = sysfs_find_dirent(parent_sd, dentry->d_name.name);
/* no such entry */
- if (!sd)
+ if (!sd) {
+ ret = ERR_PTR(-ENOENT);
goto out_unlock;
+ }
/* attach dentry and inode */
inode = sysfs_get_inode(sd);