From: Zhang Xiaoxu zhangxiaoxu5@huawei.com
commit 9ffad9263b467efd8f8dc7ae1941a0a655a2bab2 upstream.
When xfstest generic/035, we found the target file was deleted if the rename return -EACESS.
In cifs_rename2, we unlink the positive target dentry if rename failed with EACESS or EEXIST, even if the target dentry is positived before rename. Then the existing file was deleted.
We should just delete the target file which created during the rename.
Reported-by: Hulk Robot hulkci@huawei.com Signed-off-by: Zhang Xiaoxu zhangxiaoxu5@huawei.com Cc: stable@vger.kernel.org Signed-off-by: Steve French stfrench@microsoft.com Reviewed-by: Aurelien Aptel aaptel@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/cifs/inode.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -1770,6 +1770,7 @@ cifs_rename2(struct inode *source_dir, s FILE_UNIX_BASIC_INFO *info_buf_target; unsigned int xid; int rc, tmprc; + bool new_target = d_really_is_negative(target_dentry);
if (flags & ~RENAME_NOREPLACE) return -EINVAL; @@ -1846,8 +1847,13 @@ cifs_rename2(struct inode *source_dir, s */
unlink_target: - /* Try unlinking the target dentry if it's not negative */ - if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) { + /* + * If the target dentry was created during the rename, try + * unlinking it if it's not negative + */ + if (new_target && + d_really_is_positive(target_dentry) && + (rc == -EACCES || rc == -EEXIST)) { if (d_is_dir(target_dentry)) tmprc = cifs_rmdir(target_dir, target_dentry); else