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>
1 file changed