Commit fc6f3943 authored Apr 17, 2009 by Jeff Layton Committed by Steve French Apr 17, 2009

cifs: when renaming don't try to unlink negative dentry



When attempting to rename a file on a read-only share, the kernel can
call cifs_unlink on a negative dentry, which causes an oops. Only try
to unlink the file if it's a positive dentry.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Tested-by: Shirish Pargaonkar <shirishp@us.ibm.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>

parent 22c9d52b

fs/cifs/inode.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1453,7 +1453,8 @@ int cifs_rename(struct inode source_dir, struct dentry source_dentry,
		checking the UniqueId via FILE_INTERNAL_INFO */

		unlink_target:
		if ((rc == -EACCES) \|\| (rc == -EEXIST)) {
		/* Try unlinking the target dentry if it's not negative */
		if (target_dentry->d_inode && (rc == -EACCES \|\| rc == -EEXIST)) {
		tmprc = cifs_unlink(target_dir, target_dentry);
		if (tmprc)
		goto cifs_rename_exit;