CIFS: Fix NULL pointer dereference in mid callback

There is a race between a system call processing thread
and the demultiplex thread when mid->resp_buf becomes NULL
and later is being accessed to get credits. It happens when
the 1st thread wakes up before a mid callback is called in
the 2nd one but the mid state has already been set to
MID_RESPONSE_RECEIVED. This causes NULL pointer dereference
in mid callback.

Fix this by saving credits from the response before we
update the mid state and then use this value in the mid
callback rather then accessing a response buffer.

Cc: Stable <stable@vger.kernel.org>
Fixes: ee258d79159afed5 ("CIFS: Move credit processing to mid callbacks for SMB3")
Tested-by: Frank Sorenson <sorenson@redhat.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index d78bfcc191560804b694b965a381b21f7b5962f2..5d2dd04b55a6bbe616dccdaebc8414410e4cb100 100644 (file)
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1524,6 +1524,7 @@ struct mid_q_entry {
        struct TCP_Server_Info *server; /* server corresponding to this mid */
        __u64 mid;              /* multiplex id */
        __u16 credits;          /* number of credits consumed by this mid */
+       __u16 credits_received; /* number of credits from the response */
        __u32 pid;              /* process id */
        __u32 sequence_number;  /* for CIFS signing */
        unsigned long when_alloc;  /* when mid was created */

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ccaa8bad336f9d7e2b67cb1364a4ca4b6f1718d4..40b2a173ba0dfddac6d1905b422b09acabc9b91f 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -905,6 +905,20 @@ dequeue_mid(struct mid_q_entry *mid, bool malformed)
        spin_unlock(&GlobalMid_Lock);
 }
 
+static unsigned int
+smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
+{
+       struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
+
+       /*
+        * SMB1 does not use credits.
+        */
+       if (server->vals->header_preamble_size)
+               return 0;
+
+       return le16_to_cpu(shdr->CreditRequest);
+}
+
 static void
 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
           char *buf, int malformed)
@@ -912,6 +926,7 @@ handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
        if (server->ops->check_trans2 &&
            server->ops->check_trans2(mid, server, buf, malformed))
                return;
+       mid->credits_received = smb2_get_credits_from_hdr(buf, server);
        mid->resp_buf = buf;
        mid->large_buf = server->large_buf;
        /* Was previous buf put in mpx struct for multi-rsp? */

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index f28d4207bbdaaa8bd8c2532b9e1430c19ab43e6d..eb92cd4502cc035b05dbe4f63279740e44dadb44 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -151,13 +151,7 @@ smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 static unsigned int
 smb2_get_credits(struct mid_q_entry *mid)
 {
-       struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf;
-
-       if (mid->mid_state == MID_RESPONSE_RECEIVED
-           || mid->mid_state == MID_RESPONSE_MALFORMED)
-               return le16_to_cpu(shdr->CreditRequest);
-
-       return 0;
+       return mid->credits_received;
 }
 
 static int