diff options
| author | Tejun Heo <htejun@gmail.com> | 2008-01-16 03:06:14 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-16 17:54:03 (GMT) |
| commit | e49452c67703d3647467d65275fb893589384fed (patch) | |
| tree | 137d7dea836f16f4efc3c709981dee3d306aa757 | |
| parent | cbd9c883696da72b2b1f03f909dbacc04bbf8b58 (diff) | |
| download | linux-e49452c67703d3647467d65275fb893589384fed.tar.xz | |
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.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index 3371629..b197016 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); |