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cifs: always initialize struct msghdr smb_msg completely

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[ Upstream commit bedc8f76b3539ac4f952114b316bcc2251e808ce ]

So far we were just lucky because the uninitialized members
of struct msghdr are not used by default on a SOCK_STREAM tcp
socket.

But as new things like msg_ubuf and sg_from_iter where added
recently, we should play on the safe side and avoid potention
problems in future.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Cc: stable@vger.kernel.org
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Stefan Metzmacher 2022-09-14 05:25:47 +02:00 committed by Greg Kroah-Hartman
parent 1438e412ae
commit 8c8d0f7ac8
2 changed files with 3 additions and 10 deletions
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7
fs/cifs/connect.c
View File

@ -791,9 +791,6 @@ cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
int length = 0;
int total_read;
smb_msg->msg_control = NULL;
smb_msg->msg_controllen = 0;
for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
try_to_freeze();
@ -844,7 +841,7 @@ int
cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
unsigned int to_read)
{
struct msghdr smb_msg;
struct msghdr smb_msg = {};
struct kvec iov = {.iov_base = buf, .iov_len = to_read};
iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read);
@ -855,7 +852,7 @@ int
cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
unsigned int page_offset, unsigned int to_read)
{
struct msghdr smb_msg;
struct msghdr smb_msg = {};
struct bio_vec bv = {
.bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read);

6
fs/cifs/transport.c
View File

@ -209,10 +209,6 @@ smb_send_kvec(struct TCP_Server_Info *server, struct msghdr *smb_msg,
*sent = 0;
smb_msg->msg_name = NULL;
smb_msg->msg_namelen = 0;
smb_msg->msg_control = NULL;
smb_msg->msg_controllen = 0;
if (server->noblocksnd)
smb_msg->msg_flags = MSG_DONTWAIT + MSG_NOSIGNAL;
else
@ -324,7 +320,7 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
sigset_t mask, oldmask;
size_t total_len = 0, sent, size;
struct socket *ssocket = server->ssocket;
struct msghdr smb_msg;
struct msghdr smb_msg = {};
int val = 1;
__be32 rfc1002_marker;