cifs: prevent infinite recursion in cifs_reconnect_tcon

cifs_reconnect_tcon is called from smb_init. After a successful
reconnect, cifs_reconnect_tcon will call reset_cifs_unix_caps. That
function will, in turn call CIFSSMBQFSUnixInfo and CIFSSMBSetFSUnixInfo.
Those functions also call smb_init.

It's possible for the session and tcon reconnect to succeed, and then
for another cifs_reconnect to occur before CIFSSMBQFSUnixInfo or
CIFSSMBSetFSUnixInfo to be called. That'll cause those functions to call
smb_init and cifs_reconnect_tcon again, ad infinitum...

Break the infinite recursion by having those functions use a new
smb_init variant that doesn't attempt to perform a reconnect.

Reported-and-Tested-by: Michal Suchanek <hramrach@centrum.cz>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 33 insertions, 16 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index c65c3419dd37..7e83b356cc9e 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -232,7 +232,7 @@ static int
 small_smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
                 void **request_buf)
 {
-        int rc = 0;
+        int rc;
 
         rc = cifs_reconnect_tcon(tcon, smb_command);
         if (rc)
@@ -250,7 +250,7 @@ small_smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
         if (tcon != NULL)
                 cifs_stats_inc(&tcon->num_smbs_sent);
 
-        return rc;
+        return 0;
 }
 
 int
@@ -281,16 +281,9 @@ small_smb_init_no_tc(const int smb_command, const int wct,
 
 /* If the return code is zero, this function must fill in request_buf pointer */
 static int
-smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
-         void **request_buf /* returned */ ,
-         void **response_buf /* returned */ )
+__smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
+                        void **request_buf, void **response_buf)
 {
-        int rc = 0;
-
-        rc = cifs_reconnect_tcon(tcon, smb_command);
-        if (rc)
-                return rc;
-
         *request_buf = cifs_buf_get();
         if (*request_buf == NULL) {
                 /* BB should we add a retry in here if not a writepage? */
@@ -309,7 +302,31 @@ smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
         if (tcon != NULL)
                 cifs_stats_inc(&tcon->num_smbs_sent);
 
-        return rc;
+        return 0;
+}
+
+/* If the return code is zero, this function must fill in request_buf pointer */
+static int
+smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
+         void **request_buf, void **response_buf)
+{
+        int rc;
+
+        rc = cifs_reconnect_tcon(tcon, smb_command);
+        if (rc)
+                return rc;
+
+        return __smb_init(smb_command, wct, tcon, request_buf, response_buf);
+}
+
+static int
+smb_init_no_reconnect(int smb_command, int wct, struct cifsTconInfo *tcon,
+                        void **request_buf, void **response_buf)
+{
+        if (tcon->ses->need_reconnect || tcon->need_reconnect)
+                return -EHOSTDOWN;
+
+        return __smb_init(smb_command, wct, tcon, request_buf, response_buf);
 }
 
 static int validate_t2(struct smb_t2_rsp *pSMB)
@@ -4534,8 +4551,8 @@ CIFSSMBQFSUnixInfo(const int xid, struct cifsTconInfo *tcon)
 
         cFYI(1, "In QFSUnixInfo");
 QFSUnixRetry:
-        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
-                      (void **) &pSMBr);
+        rc = smb_init_no_reconnect(SMB_COM_TRANSACTION2, 15, tcon,
+                                   (void **) &pSMB, (void **) &pSMBr);
         if (rc)
                 return rc;
 
@@ -4604,8 +4621,8 @@ CIFSSMBSetFSUnixInfo(const int xid, struct cifsTconInfo *tcon, __u64 cap)
         cFYI(1, "In SETFSUnixInfo");
 SETFSUnixRetry:
         /* BB switch to small buf init to save memory */
-        rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
-                      (void **) &pSMBr);
+        rc = smb_init_no_reconnect(SMB_COM_TRANSACTION2, 15, tcon,
+                                        (void **) &pSMB, (void **) &pSMBr);
         if (rc)
                 return rc;