smb: client: reduce stack usage in smb2_query_info_compound()

Clang warns about exceeded stack frame size

  fs/smb/client/smb2ops.c:2521:1: warning: stack frame size (1336)
  exceeds limit (1024) in 'smb2_query_info_compound'
  [-Wframe-larger-than]

Fix this by allocating a structure that will hold most of the large
variables.

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: Paulo Alcantara

fs/smb/client/smb2ops.c

@@ -2513,15 +2513,13 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
 			 struct kvec *rsp, int *buftype,
 			 struct cifs_sb_info *cifs_sb)
 {
+	struct smb2_compound_vars *vars;
 	struct cifs_ses *ses = tcon->ses;
 	struct TCP_Server_Info *server = cifs_pick_channel(ses);
 	int flags = CIFS_CP_CREATE_CLOSE_OP;
-	struct smb_rqst rqst[3];
+	struct smb_rqst *rqst;
 	int resp_buftype[3];
-	struct kvec rsp_iov[3];
-	struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
-	struct kvec qi_iov[1];
-	struct kvec close_iov[1];
+	struct kvec *rsp_iov;
 	u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 	struct cifs_open_parms oparms;
 	struct cifs_fid fid;
@@ -2538,9 +2536,14 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
 	if (smb3_encryption_required(tcon))
 		flags |= CIFS_TRANSFORM_REQ;
 
-	memset(rqst, 0, sizeof(rqst));
 	resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
-	memset(rsp_iov, 0, sizeof(rsp_iov));
+	vars = kzalloc(sizeof(*vars), GFP_KERNEL);
+	if (!vars) {
+		rc = -ENOMEM;
+		goto out_free_path;
+	}
+	rqst = vars->rqst;
+	rsp_iov = vars->rsp_iov;
 
 	/*
 	 * We can only call this for things we know are directories.
@@ -2549,8 +2552,7 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
 		open_cached_dir(xid, tcon, path, cifs_sb, false,
 				&cfid); /* cfid null if open dir failed */
 
-	memset(&open_iov, 0, sizeof(open_iov));
-	rqst[0].rq_iov = open_iov;
+	rqst[0].rq_iov = vars->open_iov;
 	rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
 
 	oparms = (struct cifs_open_parms) {
@@ -2568,8 +2570,7 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
 		goto qic_exit;
 	smb2_set_next_command(tcon, &rqst[0]);
 
-	memset(&qi_iov, 0, sizeof(qi_iov));
-	rqst[1].rq_iov = qi_iov;
+	rqst[1].rq_iov = &vars->qi_iov;
 	rqst[1].rq_nvec = 1;
 
 	if (cfid) {
@@ -2596,8 +2597,7 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
 		smb2_set_related(&rqst[1]);
 	}
 
-	memset(&close_iov, 0, sizeof(close_iov));
-	rqst[2].rq_iov = close_iov;
+	rqst[2].rq_iov = &vars->close_iov;
 	rqst[2].rq_nvec = 1;
 
 	rc = SMB2_close_init(tcon, server,
@@ -2628,14 +2628,16 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
 	*buftype = resp_buftype[1];
 
  qic_exit:
-	kfree(utf16_path);
 	SMB2_open_free(&rqst[0]);
 	SMB2_query_info_free(&rqst[1]);
 	SMB2_close_free(&rqst[2]);
 	free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 	free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
 	if (cfid)
 		close_cached_dir(cfid);
+	kfree(vars);
+out_free_path:
+	kfree(utf16_path);
 	return rc;
 }