smb: client: fix potential deadlock when releasing mids

commit e6322fd upstream.

All release_mid() callers seem to hold a reference of @mid so there is
no need to call kref_put(&mid->refcount, __release_mid) under
@server->mid_lock spinlock.  If they don't, then an use-after-free bug
would have occurred anyways.

By getting rid of such spinlock also fixes a potential deadlock as
shown below

CPU 0                                CPU 1
------------------------------------------------------------------
cifs_demultiplex_thread()            cifs_debug_data_proc_show()
 release_mid()
  spin_lock(&server->mid_lock);
                                     spin_lock(&cifs_tcp_ses_lock)
				      spin_lock(&server->mid_lock)
  __release_mid()
   smb2_find_smb_tcon()
    spin_lock(&cifs_tcp_ses_lock) *deadlock*

Cc: [email protected]
Signed-off-by: Paulo Alcantara (SUSE) <[email protected]>
Signed-off-by: Steve French <[email protected]>
[cifs_mid_q_entry_release() is renamed to release_mid() and
 _cifs_mid_q_entry_release() is renamed to __release_mid() by
 commit 70f08f9 ("cifs: remove useless DeleteMidQEntry()")
 which is integrated into v6.0, so preserve old names in v5.15.]
Signed-off-by: Cliff Liu <[email protected]>
Signed-off-by: He Zhe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit ce49569079a9d4cad26c0f1d4653382fd9a5ca7a)
Signed-off-by: Vijayendra Suman <[email protected]>

Author: Paulo Alcantara

fs/cifs/cifsproto.h

@@ -83,7 +83,7 @@ extern struct mid_q_entry *AllocMidQEntry(const struct smb_hdr *smb_buffer,
 					struct TCP_Server_Info *server);
 extern void DeleteMidQEntry(struct mid_q_entry *midEntry);
 extern void cifs_delete_mid(struct mid_q_entry *mid);
-extern void cifs_mid_q_entry_release(struct mid_q_entry *midEntry);
+void _cifs_mid_q_entry_release(struct kref *refcount);
 extern void cifs_wake_up_task(struct mid_q_entry *mid);
 extern int cifs_handle_standard(struct TCP_Server_Info *server,
 				struct mid_q_entry *mid);
@@ -637,4 +637,9 @@ static inline int cifs_create_options(struct cifs_sb_info *cifs_sb, int options)
 struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon);
 void cifs_put_tcon_super(struct super_block *sb);
 
+static inline void cifs_mid_q_entry_release(struct mid_q_entry *midEntry)
+{
+	kref_put(&midEntry->refcount, _cifs_mid_q_entry_release);
+}
+
 #endif			/* _CIFSPROTO_H */

fs/cifs/smb2misc.c

@@ -759,7 +759,7 @@ __smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid,
 {
 	struct close_cancelled_open *cancelled;
 
-	cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC);
+	cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
 	if (!cancelled)
 		return -ENOMEM;
 

fs/cifs/transport.c

@@ -75,7 +75,7 @@ AllocMidQEntry(const struct smb_hdr *smb_buffer, struct TCP_Server_Info *server)
 	return temp;
 }
 
-static void _cifs_mid_q_entry_release(struct kref *refcount)
+void _cifs_mid_q_entry_release(struct kref *refcount)
 {
 	struct mid_q_entry *midEntry =
 			container_of(refcount, struct mid_q_entry, refcount);
@@ -155,13 +155,6 @@ static void _cifs_mid_q_entry_release(struct kref *refcount)
 	mempool_free(midEntry, cifs_mid_poolp);
 }
 
-void cifs_mid_q_entry_release(struct mid_q_entry *midEntry)
-{
-	spin_lock(&GlobalMid_Lock);
-	kref_put(&midEntry->refcount, _cifs_mid_q_entry_release);
-	spin_unlock(&GlobalMid_Lock);
-}
-
 void DeleteMidQEntry(struct mid_q_entry *midEntry)
 {
 	cifs_mid_q_entry_release(midEntry);