linux-kernel - [PATCH 5.15 134/530] smb3: must initialize two ACL struct fields to zero

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Date:   Mon, 24 Oct 2022 13:27:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Paulo Alcantara (SUSE)" <pc@....nz>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.15 134/530] smb3: must initialize two ACL struct fields to zero

From: Steve French <stfrench@...rosoft.com>

commit f09bd695af3b8ab46fc24e5d6954a24104c38387 upstream.

Coverity spotted that we were not initalizing Stbz1 and Stbz2 to
zero in create_sd_buf.

Addresses-Coverity: 1513848 ("Uninitialized scalar variable")
Cc: <stable@...r.kernel.org>
Reviewed-by: Paulo Alcantara (SUSE) <pc@....nz>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/cifs/smb2pdu.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2354,7 +2354,7 @@ create_sd_buf(umode_t mode, bool set_own
 	unsigned int acelen, acl_size, ace_count;
 	unsigned int owner_offset = 0;
 	unsigned int group_offset = 0;
-	struct smb3_acl acl;
+	struct smb3_acl acl = {};
 
 	*len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
 
@@ -2427,6 +2427,7 @@ create_sd_buf(umode_t mode, bool set_own
 	acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
 	acl.AclSize = cpu_to_le16(acl_size);
 	acl.AceCount = cpu_to_le16(ace_count);
+	/* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
 	memcpy(aclptr, &acl, sizeof(struct smb3_acl));
 
 	buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);