blob: 4fdc5223a7fabc31995638044134a1ae3c3cd8d1 [file] [log] [blame]
From 1630d25429cc2f9117ba7e07d863f5b7a751c2f3 Mon Sep 17 00:00:00 2001
From: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Date: Sun, 28 Jun 2020 21:06:38 -0400
Subject: [PATCH] cifs: Fix the target file was deleted when rename failed.
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: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 7e35b2560e79..80caafe24679 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1783,6 +1783,7 @@ cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
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;
@@ -1859,8 +1860,13 @@ cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
*/
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
--
2.27.0