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| author | Stefan Metzmacher <metze@samba.org> | 2022-09-14 05:25:47 +0200 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2022-09-13 22:55:45 -0500 |
| commit | bedc8f76b3539ac4f952114b316bcc2251e808ce (patch) | |
| tree | 7459f5678cd94b2c88499249de5a1ee0abe6d0ae | |
| parent | 17d3df38dc5f4cec9b0ac6eb79c1859b6e2693a4 (diff) | |
| download | linux-bedc8f76b3539ac4f952114b316bcc2251e808ce.tar.gz linux-bedc8f76b3539ac4f952114b316bcc2251e808ce.tar.bz2 linux-bedc8f76b3539ac4f952114b316bcc2251e808ce.zip | |
cifs: always initialize struct msghdr smb_msg completely
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>
| -rw-r--r-- | fs/cifs/connect.c | 11 | ||||
| -rw-r--r-- | fs/cifs/transport.c | 6 |
2 files changed, 4 insertions, 13 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index a0a06b6f252b..0225f4c8adf0 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -702,9 +702,6 @@ 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(); @@ -760,7 +757,7 @@ 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); @@ -770,15 +767,13 @@ cifs_read_from_socket(struct TCP_Server_Info *server, char *buf, ssize_t cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read) { - struct msghdr smb_msg; + struct msghdr smb_msg = {}; /* * iov_iter_discard already sets smb_msg.type and count and iov_offset * and cifs_readv_from_socket sets msg_control and msg_controllen * so little to initialize in struct msghdr */ - smb_msg.msg_name = NULL; - smb_msg.msg_namelen = 0; iov_iter_discard(&smb_msg.msg_iter, READ, to_read); return cifs_readv_from_socket(server, &smb_msg); @@ -788,7 +783,7 @@ 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); diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c index a43c87c1d343..9a2753e21170 100644 --- a/fs/cifs/transport.c +++ b/fs/cifs/transport.c @@ -194,10 +194,6 @@ 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 @@ -309,7 +305,7 @@ __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 = {}; __be32 rfc1002_marker; if (cifs_rdma_enabled(server)) { |