[PATCH 5.13 014/151] cifs: Handle race conditions during rename

Greg Kroah-Hartman
2021-08-16T13:19:56Z

From: Rohith Surabattula <rohiths@microsoft.com>

commit 41535701da3324b80029cabb501e86c4fafe339d upstream.

When rename is executed on directory which has files for which
close is deferred, then rename will fail with EACCES.

This patch will try to close all deferred files when EACCES is received
and retry rename on a directory.

Signed-off-by: Rohith Surabattula <rohiths@microsoft.com>
Cc: stable@vger.kernel.org # 5.13
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/cifs/inode.c | 19 +++++++++++++++++--
fs/cifs/misc.c | 16 +++++++++++-----
2 files changed, 28 insertions(+), 7 deletions(-)

--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1637,7 +1637,7 @@ int cifs_unlink(struct inode *dir, struc
goto unlink_out;
}

- cifs_close_all_deferred_files(tcon);
+ cifs_close_deferred_file(CIFS_I(inode));
if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
rc = CIFSPOSIXDelFile(xid, tcon, full_path,
@@ -2096,6 +2096,7 @@ cifs_rename2(struct user_namespace *mnt_
FILE_UNIX_BASIC_INFO *info_buf_target;
unsigned int xid;
int rc, tmprc;
+ int retry_count = 0;

if (flags & ~RENAME_NOREPLACE)
return -EINVAL;
@@ -2125,10 +2126,24 @@ cifs_rename2(struct user_namespace *mnt_
goto cifs_rename_exit;
}

- cifs_close_all_deferred_files(tcon);
+ cifs_close_deferred_file(CIFS_I(d_inode(source_dentry)));
+ if (d_inode(target_dentry) != NULL)
+ cifs_close_deferred_file(CIFS_I(d_inode(target_dentry)));
+
rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
to_name);

+ if (rc == -EACCES) {
+ while (retry_count < 3) {
+ cifs_close_all_deferred_files(tcon);
+ rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
+ to_name);
+ if (rc != -EACCES)
+ break;
+ retry_count++;
+ }
+ }
+
/*
* No-replace is the natural behavior for CIFS, so skip unlink hacks.
*/
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -735,13 +735,19 @@ void
cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode)
{
struct cifsFileInfo *cfile = NULL;
- struct cifs_deferred_close *dclose;
+
+ if (cifs_inode == NULL)
+ return;

list_for_each_entry(cfile, &cifs_inode->openFileList, flist) {
- spin_lock(&cifs_inode->deferred_lock);
- if (cifs_is_deferred_close(cfile, &dclose))
- mod_delayed_work(deferredclose_wq, &cfile->deferred, 0);
- spin_unlock(&cifs_inode->deferred_lock);
+ if (delayed_work_pending(&cfile->deferred)) {
+ /*
+ * If there is no pending work, mod_delayed_work queues new work.
+ * So, Increase the ref count to avoid use-after-free.
+ */
+ if (!mod_delayed_work(deferredclose_wq, &cfile->deferred, 0))
+ cifsFileInfo_get(cfile);
+ }
}
}