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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-22 02:22:44 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-06-29 12:57:36 +0400
commitda53be12bbb4fabbe2e9f6f908de0cf478b5161d (patch)
treea0436fb462a7b16c82e58336e17c55b814f7be6b /fs/proc
parent642b704cd7a29be0b8900971eb525086c1c995b7 (diff)
downloadlinux-da53be12bbb4fabbe2e9f6f908de0cf478b5161d.tar.xz
Don't pass inode to ->d_hash() and ->d_compare()
Instances either don't look at it at all (the majority of cases) or only want it to find the superblock (which can be had as dentry->d_sb). A few cases that want more are actually safe with dentry->d_inode - the only precaution needed is the check that it hadn't been replaced with NULL by rmdir() or by overwriting rename(), which case should be simply treated as cache miss. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/proc_sysctl.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index f3a570e7c257..71290463a1d3 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -796,15 +796,16 @@ static int sysctl_is_seen(struct ctl_table_header *p)
return res;
}
-static int proc_sys_compare(const struct dentry *parent,
- const struct inode *pinode,
- const struct dentry *dentry, const struct inode *inode,
+static int proc_sys_compare(const struct dentry *parent, const struct dentry *dentry,
unsigned int len, const char *str, const struct qstr *name)
{
struct ctl_table_header *head;
+ struct inode *inode;
+
/* Although proc doesn't have negative dentries, rcu-walk means
* that inode here can be NULL */
/* AV: can it, indeed? */
+ inode = ACCESS_ONCE(dentry->d_inode);
if (!inode)
return 1;
if (name->len != len)