cifs: allow calling SMB2_xxx_free(NULL)

Change these free functions to allow passing NULL as the argument and
treat it as a no-op just like free(NULL) would.
Or, if rqst->rq_iov is NULL.

The second scenario could happen for smb2_queryfs() if the call
to SMB2_query_info_init() fails and we go to qfs_exit to clean up
and free all resources.
In that case we have not yet assigned rqst[2].rq_iov and thus
the rq_iov dereference in SMB2_close_free() will cause a NULL pointer
dereference.

Fixes:  1eb9fb52040f ("cifs: create SMB2_open_init()/SMB2_open_free() helpers")

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
CC: Stable <stable@vger.kernel.org>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 5a08c8f..7d7b016 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2243,10 +2243,12 @@ SMB2_open_free(struct smb_rqst *rqst)
 {
        int i;
 
-       cifs_small_buf_release(rqst->rq_iov[0].iov_base);
-       for (i = 1; i < rqst->rq_nvec; i++)
-               if (rqst->rq_iov[i].iov_base != smb2_padding)
-                       kfree(rqst->rq_iov[i].iov_base);
+       if (rqst && rqst->rq_iov) {
+               cifs_small_buf_release(rqst->rq_iov[0].iov_base);
+               for (i = 1; i < rqst->rq_nvec; i++)
+                       if (rqst->rq_iov[i].iov_base != smb2_padding)
+                               kfree(rqst->rq_iov[i].iov_base);
+       }
 }
 
 int
@@ -2536,7 +2538,8 @@ SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
 void
 SMB2_close_free(struct smb_rqst *rqst)
 {
-       cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
+       if (rqst && rqst->rq_iov)
+               cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
 }
 
 int
@@ -2689,7 +2692,8 @@ SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
 void
 SMB2_query_info_free(struct smb_rqst *rqst)
 {
-       cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
+       if (rqst && rqst->rq_iov)
+               cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
 }
 
 static int
@@ -3803,7 +3807,8 @@ SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
 void
 SMB2_set_info_free(struct smb_rqst *rqst)
 {
-       cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
+       if (rqst && rqst->rq_iov)
+               cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
 }
 
 static int