From: Paulo Alcantara <paulo@paulo.ac>
Date: Sat, 23 Jun 2018 14:52:25 -0300
Subject: [PATCH] cifs: Make sure all data pages are signed correctly
Git-commit: a12d0c590cc7ae01892f06c5ad6d19580ecdd0de
Patch-mainline: v4.18
References: bsc#1144333

Check if every data page is signed correctly in sigining helper.

Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Aurelien Aptel <aaptel@suse.com>
---
 fs/cifs/cifsencrypt.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index b4672eafc5bf..85b31cfa2f3c 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -83,7 +83,13 @@ int __cifs_calc_signature(struct smb_rqst *rqst,
 
 		kaddr = (char *) kmap(rqst->rq_pages[i]) + offset;
 
-		crypto_shash_update(shash, kaddr, len);
+		rc = crypto_shash_update(shash, kaddr, len);
+		if (rc) {
+			cifs_dbg(VFS, "%s: Could not update with payload\n",
+				 __func__);
+			kunmap(rqst->rq_pages[i]);
+			return rc;
+		}
 
 		kunmap(rqst->rq_pages[i]);
 	}
-- 
2.16.4