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

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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>
This commit is contained in:
Jeff Layton 2009-04-17 11:45:30 -04:00 committed by Steve French
parent 22c9d52bc0
commit fc6f394332
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/inode.c
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@ -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;