[PATCH AUTOSEL 5.17 35/48] cifs: fix signed integer overflow when fl_end is OFFSET_MAX

[PATCH AUTOSEL 5.17 35/48] cifs: fix signed integer overflow when fl_end is OFFSET_MAX

[Sasha Levin]

From: Paulo Alcantara <pc@cjr.nz>

[ Upstream commit d80c69846ddfddf437167b31ab4cd0de12f61001 ]

This fixes the following when running xfstests generic/504:

[  134.394698] CIFS: Attempting to mount \\win16.vm.test\Share
[  134.420905] CIFS: VFS: generate_smb3signingkey: dumping generated
AES session keys
[  134.420911] CIFS: VFS: Session Id    05 00 00 00 00 c4 00 00
[  134.420914] CIFS: VFS: Cipher type   1
[  134.420917] CIFS: VFS: Session Key   ea 0b d9 22 2e af 01 69 30 1b
15 74 bf 87 41 11
[  134.420920] CIFS: VFS: Signing Key   59 28 43 5c f0 b6 b1 6f f5 7b
65 f2 9f 9e 58 7d
[  134.420923] CIFS: VFS: ServerIn Key  eb aa 58 c8 95 01 9a f7 91 98
e4 fa bc d8 74 f1
[  134.420926] CIFS: VFS: ServerOut Key 08 5b 21 e5 2e 4e 86 f6 05 c2
58 e0 af 53 83 e7
[  134.771946]
================================================================================
[  134.771953] UBSAN: signed-integer-overflow in fs/cifs/file.c:1706:19
[  134.771957] 9223372036854775807 + 1 cannot be represented in type
'long long int'
[  134.771960] CPU: 4 PID: 2773 Comm: flock Not tainted 5.11.22 #1
[  134.771964] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[  134.771966] Call Trace:
[  134.771970]  dump_stack+0x8d/0xb5
[  134.771981]  ubsan_epilogue+0x5/0x50
[  134.771988]  handle_overflow+0xa3/0xb0
[  134.771997]  ? lockdep_hardirqs_on_prepare+0xe8/0x1b0
[  134.772006]  cifs_setlk+0x63c/0x680 [cifs]
[  134.772085]  ? _get_xid+0x5f/0xa0 [cifs]
[  134.772085]  cifs_flock+0x131/0x400 [cifs]
[  134.772085]  __x64_sys_flock+0xfc/0x120
[  134.772085]  do_syscall_64+0x33/0x40
[  134.772085]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  134.772085] RIP: 0033:0x7fea4f83b3fb
[  134.772085] Code: ff 48 8b 15 8f 1a 0d 00 f7 d8 64 89 02 b8 ff ff
ff ff eb da e8 16 0b 02 00 66 0f 1f 44 00 00 f3 0f 1e fa b8 49 00 00
00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 5d 1a 0d 00 f7 d8 64 89
01 48

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/cifs/cifsglob.h | 5 +++++
 fs/cifs/cifssmb.c  | 3 ++-
 fs/cifs/file.c     | 8 ++++----
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 560ecc4ad87d..3c7865186e5e 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1983,4 +1983,9 @@ static inline bool cifs_is_referral_server(struct cifs_tcon *tcon,
 	return is_tcon_dfs(tcon) || (ref && (ref->flags & DFSREF_REFERRAL_SERVER));
 }
 
+static inline u64 cifs_flock_len(struct file_lock *fl)
+{
+	return fl->fl_end == OFFSET_MAX ? 0 : fl->fl_end - fl->fl_start + 1;
+}
+
 #endif	/* _CIFS_GLOB_H */
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index aca9338b0877..83820205d644 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -2558,7 +2558,8 @@ CIFSSMBPosixLock(const unsigned int xid, struct cifs_tcon *tcon,
 
 			pLockData->fl_start = le64_to_cpu(parm_data->start);
 			pLockData->fl_end = pLockData->fl_start +
-					le64_to_cpu(parm_data->length) - 1;
+				(le64_to_cpu(parm_data->length) ?
+				 le64_to_cpu(parm_data->length) - 1 : 0);
 			pLockData->fl_pid = -le32_to_cpu(parm_data->pid);
 		}
 	}
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index a2723f7cb5e9..b8a4b43870fe 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1395,7 +1395,7 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
 			cifs_dbg(VFS, "Can't push all brlocks!\n");
 			break;
 		}
-		length = 1 + flock->fl_end - flock->fl_start;
+		length = cifs_flock_len(flock);
 		if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
 			type = CIFS_RDLCK;
 		else
@@ -1511,7 +1511,7 @@ cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
 	   bool wait_flag, bool posix_lck, unsigned int xid)
 {
 	int rc = 0;
-	__u64 length = 1 + flock->fl_end - flock->fl_start;
+	__u64 length = cifs_flock_len(flock);
 	struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
 	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 	struct TCP_Server_Info *server = tcon->ses->server;
@@ -1609,7 +1609,7 @@ cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
 	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 	struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
 	struct cifsLockInfo *li, *tmp;
-	__u64 length = 1 + flock->fl_end - flock->fl_start;
+	__u64 length = cifs_flock_len(flock);
 	struct list_head tmp_llist;
 
 	INIT_LIST_HEAD(&tmp_llist);
@@ -1713,7 +1713,7 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
 	   unsigned int xid)
 {
 	int rc = 0;
-	__u64 length = 1 + flock->fl_end - flock->fl_start;
+	__u64 length = cifs_flock_len(flock);
 	struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
 	struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 	struct TCP_Server_Info *server = tcon->ses->server;
-- 
2.35.1

[PATCH AUTOSEL 5.17 37/48] cifs: return ENOENT for DFS lookup_cache_entry()

[Sasha Levin]

From: Enzo Matsumiya <ematsumiya@suse.de>

[ Upstream commit 337b8b0e4343567221ef8d88aac5e418208d4ac1 ]

EEXIST didn't make sense to use when dfs_cache_find() couldn't find a
cache entry nor retrieve a referral target.

It also doesn't make sense cifs_dfs_query_info_nonascii_quirk() to
emulate ENOENT anymore.

Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/cifs/connect.c   | 6 ++++--
 fs/cifs/dfs_cache.c | 6 +++---
 fs/cifs/misc.c      | 6 +-----
 3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index c3a26f06fdaa..1ec77ebc71a0 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3420,8 +3420,9 @@ cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
 }
 
 /*
- * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
- * otherwise 0.
+ * Check if path is remote (i.e. a DFS share).
+ *
+ * Return -EREMOTE if it is, otherwise 0 or -errno.
  */
 static int is_path_remote(struct mount_ctx *mnt_ctx)
 {
@@ -3703,6 +3704,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
 	if (!isdfs)
 		goto out;
 
+	/* proceed as DFS mount */
 	uuid_gen(&mnt_ctx.mount_id);
 	rc = connect_dfs_root(&mnt_ctx, &tl);
 	dfs_cache_free_tgts(&tl);
diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
index 956f8e5cf3e7..c5dd6f7305bd 100644
--- a/fs/cifs/dfs_cache.c
+++ b/fs/cifs/dfs_cache.c
@@ -654,7 +654,7 @@ static struct cache_entry *__lookup_cache_entry(const char *path, unsigned int h
 			return ce;
 		}
 	}
-	return ERR_PTR(-EEXIST);
+	return ERR_PTR(-ENOENT);
 }
 
 /*
@@ -662,7 +662,7 @@ static struct cache_entry *__lookup_cache_entry(const char *path, unsigned int h
  *
  * Use whole path components in the match.  Must be called with htable_rw_lock held.
  *
- * Return ERR_PTR(-EEXIST) if the entry is not found.
+ * Return ERR_PTR(-ENOENT) if the entry is not found.
  */
 static struct cache_entry *lookup_cache_entry(const char *path)
 {
@@ -710,7 +710,7 @@ static struct cache_entry *lookup_cache_entry(const char *path)
 		while (e > s && *e != sep)
 			e--;
 	}
-	return ERR_PTR(-EEXIST);
+	return ERR_PTR(-ENOENT);
 }
 
 /**
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index afaf59c22193..a5b5b15e658a 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -1309,7 +1309,7 @@ int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix)
  * for "\<server>\<dfsname>\<linkpath>" DFS reference,
  * where <dfsname> contains non-ASCII unicode symbols.
  *
- * Check such DFS reference and emulate -ENOENT if it is actual.
+ * Check such DFS reference.
  */
 int cifs_dfs_query_info_nonascii_quirk(const unsigned int xid,
 				       struct cifs_tcon *tcon,
@@ -1341,10 +1341,6 @@ int cifs_dfs_query_info_nonascii_quirk(const unsigned int xid,
 		cifs_dbg(FYI, "DFS ref '%s' is found, emulate -EREMOTE\n",
 			 dfspath);
 		rc = -EREMOTE;
-	} else if (rc == -EEXIST) {
-		cifs_dbg(FYI, "DFS ref '%s' is not found, emulate -ENOENT\n",
-			 dfspath);
-		rc = -ENOENT;
 	} else {
 		cifs_dbg(FYI, "%s: dfs_cache_find returned %d\n", __func__, rc);
 	}
-- 
2.35.1

[PATCH AUTOSEL 5.17 44/48] smb3: check for null tcon

[Sasha Levin]

From: Steve French <stfrench@microsoft.com>

[ Upstream commit bbdf6cf56c88845fb0b713cbf5c6623c53fe40d8 ]

Although unlikely to be null, it is confusing to use a pointer
before checking for it to be null so move the use down after
null check.

Addresses-Coverity: 1517586 ("Null pointer dereferences  (REVERSE_INULL)")
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/cifs/smb2ops.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 13080d6a140b..584b78d88db6 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -757,8 +757,8 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 		struct cifs_sb_info *cifs_sb,
 		struct cached_fid **cfid)
 {
-	struct cifs_ses *ses = tcon->ses;
-	struct TCP_Server_Info *server = ses->server;
+	struct cifs_ses *ses;
+	struct TCP_Server_Info *server;
 	struct cifs_open_parms oparms;
 	struct smb2_create_rsp *o_rsp = NULL;
 	struct smb2_query_info_rsp *qi_rsp = NULL;
@@ -776,6 +776,9 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 	if (tcon->nohandlecache)
 		return -ENOTSUPP;
 
+	ses = tcon->ses;
+	server = ses->server;
+
 	if (cifs_sb->root == NULL)
 		return -ENOENT;
 
-- 
2.35.1

[PATCH AUTOSEL 5.17 46/48] cifs: do not use tcpStatus after negotiate completes

[Sasha Levin]

From: Shyam Prasad N <sprasad@microsoft.com>

[ Upstream commit 1a6a41d4cedd9b302e2200e6f0e3c44dbbe13689 ]

Recent changes to multichannel to allow channel reconnects to
work in parallel and independent of each other did so by
making use of tcpStatus for the connection, and status for the
session. However, this did not take into account the multiuser
scenario, where same connection is used by multiple connections.

However, tcpStatus should be tracked only till the end of
negotiate exchange, and not used for session setup. This change
fixes this.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/cifs/connect.c       | 23 +++++++++++------------
 fs/cifs/smb2pdu.c       |  3 ++-
 fs/cifs/smb2transport.c |  3 ++-
 3 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 1ec77ebc71a0..9aae410a17f8 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3962,7 +3962,7 @@ cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
 	if (rc == 0) {
 		spin_lock(&cifs_tcp_ses_lock);
 		if (server->tcpStatus == CifsInNegotiate)
-			server->tcpStatus = CifsNeedSessSetup;
+			server->tcpStatus = CifsGood;
 		else
 			rc = -EHOSTDOWN;
 		spin_unlock(&cifs_tcp_ses_lock);
@@ -3985,19 +3985,18 @@ cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
 	bool is_binding = false;
 
 	/* only send once per connect */
+	spin_lock(&ses->chan_lock);
+	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
+	spin_unlock(&ses->chan_lock);
+
 	spin_lock(&cifs_tcp_ses_lock);
-	if ((server->tcpStatus != CifsNeedSessSetup) &&
-	    (ses->status == CifsGood)) {
+	if (ses->status == CifsExiting) {
 		spin_unlock(&cifs_tcp_ses_lock);
 		return 0;
 	}
-	server->tcpStatus = CifsInSessSetup;
+	ses->status = CifsInSessSetup;
 	spin_unlock(&cifs_tcp_ses_lock);
 
-	spin_lock(&ses->chan_lock);
-	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
-	spin_unlock(&ses->chan_lock);
-
 	if (!is_binding) {
 		ses->capabilities = server->capabilities;
 		if (!linuxExtEnabled)
@@ -4021,13 +4020,13 @@ cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
 	if (rc) {
 		cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
 		spin_lock(&cifs_tcp_ses_lock);
-		if (server->tcpStatus == CifsInSessSetup)
-			server->tcpStatus = CifsNeedSessSetup;
+		if (ses->status == CifsInSessSetup)
+			ses->status = CifsNeedSessSetup;
 		spin_unlock(&cifs_tcp_ses_lock);
 	} else {
 		spin_lock(&cifs_tcp_ses_lock);
-		if (server->tcpStatus == CifsInSessSetup)
-			server->tcpStatus = CifsGood;
+		if (ses->status == CifsInSessSetup)
+			ses->status = CifsGood;
 		/* Even if one channel is active, session is in good state */
 		ses->status = CifsGood;
 		spin_unlock(&cifs_tcp_ses_lock);
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 1704fd358b85..55e6879ef18b 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3904,7 +3904,8 @@ SMB2_echo(struct TCP_Server_Info *server)
 	cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
 
 	spin_lock(&cifs_tcp_ses_lock);
-	if (server->tcpStatus == CifsNeedNegotiate) {
+	if (server->ops->need_neg &&
+	    server->ops->need_neg(server)) {
 		spin_unlock(&cifs_tcp_ses_lock);
 		/* No need to send echo on newly established connections */
 		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
index 2af79093b78b..01b732641edb 100644
--- a/fs/cifs/smb2transport.c
+++ b/fs/cifs/smb2transport.c
@@ -641,7 +641,8 @@ smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
 	if (!is_signed)
 		return 0;
 	spin_lock(&cifs_tcp_ses_lock);
-	if (server->tcpStatus == CifsNeedNegotiate) {
+	if (server->ops->need_neg &&
+	    server->ops->need_neg(server)) {
 		spin_unlock(&cifs_tcp_ses_lock);
 		return 0;
 	}
-- 
2.35.1