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authorDavid Howells <dhowells@redhat.com>2015-01-27 15:18:39 +0000
committerAl Viro <viro@zeniv.linux.org.uk>2015-02-20 04:56:43 -0500
commit112fc894a7c49e6435f91faa1cebfd425e6f3ace (patch)
tree931871efbfd4ed07b370a784e37edd18c72bad0c
parenta457ac28543cfa5101222b5ef90329c36611107c (diff)
configfs: Fix potential NULL d_inode dereference
Code that does this: if (!(d_unhashed(dentry) && dentry->d_inode)) { ... simple_unlink(parent->d_inode, dentry); } is broken because: !(d_unhashed(dentry) && dentry->d_inode) is equivalent to: !d_unhashed(dentry) || !dentry->d_inode so it is possible to get into simple_unlink() with dentry->d_inode == NULL. simple_unlink(), however, assumes dentry->d_inode cannot be NULL. I think that what was meant is this: !d_unhashed(dentry) && dentry->d_inode and that the logical-not operator or the final close-bracket was misplaced. Signed-off-by: David Howells <dhowells@redhat.com> cc: Joel Becker <joel.becker@oracle.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/configfs/inode.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index 60727db7b0a3..5423a6a6ecc8 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -236,7 +236,7 @@ void configfs_drop_dentry(struct configfs_dirent * sd, struct dentry * parent)
if (dentry) {
spin_lock(&dentry->d_lock);
- if (!(d_unhashed(dentry) && dentry->d_inode)) {
+ if (!d_unhashed(dentry) && dentry->d_inode) {
dget_dlock(dentry);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);