[PATCH 5.15.y] smb: client: fix potential deadlock when releasing mids

[Cliff Liu]

From: Paulo Alcantara <pc@xxxxxxxxxxxxx>

[ Upstream commit e6322fd177c6885a21dd4609dc5e5c973d1a2eb7 ]

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: stable@xxxxxxxxxxxxxxx
Signed-off-by: Paulo Alcantara (SUSE) <pc@xxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
[cifs_mid_q_entry_release() is renamed to release_mid() and
 _cifs_mid_q_entry_release() is renamed to __release_mid() by
 commit 70f08f914a37 ("cifs: remove useless DeleteMidQEntry()")
 which is integrated into v6.0, so preserve old names in v5.15.]
Signed-off-by: Cliff Liu <donghua.liu@xxxxxxxxxxxxx>
Signed-off-by: He Zhe <Zhe.He@xxxxxxxxxxxxx>
---
Verified the build test.
---
 fs/cifs/cifsproto.h | 7 ++++++-
 fs/cifs/smb2misc.c  | 2 +-
 fs/cifs/transport.c | 9 +--------
 3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 50844d51da5d..7d00802f9722 100644
--- a/fs/cifs/cifsproto.h
+++ b/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 */
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
index 8f409404aee1..89a2f38f17f3 100644
--- a/fs/cifs/smb2misc.c
+++ b/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;
 
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 49b7edbe3497..57d72eb13f8b 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -73,7 +73,7 @@ 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);
@@ -152,13 +152,6 @@ 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);
-- 
2.34.1