From: Enzo Matsumiya <ematsumiya@suse.de>
Date: Wed, 12 Oct 2022 22:53:09 -0500
Subject: [PATCH] cifs: use ALIGN() and round_up() macros
Git-commit: d7173623bf0b1503bc4e6f13cd0fccab5e98c6ce
References: bsc#1190317
Patch-mainline: v6.1-rc1
Improve code readability by using existing macros:
Replace hardcoded alignment computations (e.g. (len + 7) & ~0x7) by
ALIGN()/IS_ALIGNED() macros.
Also replace (DIV_ROUND_UP(len, 8) * 8) with ALIGN(len, 8), which, if
not optimized by the compiler, has the overhead of a multiplication
and a division. Do the same for roundup() by replacing it by round_up()
(division-less version, but requires the multiple to be a power of 2,
which is always the case for us).
And remove some unnecessary checks where !IS_ALIGNED() would fit, but
calling round_up() directly is fine as it's a no-op if the value is
already aligned.
Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
---
fs/cifs/cifssmb.c | 2 +-
fs/cifs/connect.c | 11 +++++++++--
fs/cifs/sess.c | 18 ++++++------------
fs/cifs/smb2misc.c | 2 +-
fs/cifs/smb2pdu.c | 27 +++++++++++----------------
5 files changed, 28 insertions(+), 32 deletions(-)
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -2820,7 +2820,7 @@ int CIFSSMBRenameOpenFile(const unsigned
remap);
}
rename_info->target_name_len = cpu_to_le32(2 * len_of_str);
- count = 12 /* sizeof(struct set_file_rename) */ + (2 * len_of_str);
+ count = sizeof(struct set_file_rename) + (2 * len_of_str);
byte_count += count;
pSMB->DataCount = cpu_to_le16(count);
pSMB->TotalDataCount = pSMB->DataCount;
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -4013,9 +4013,12 @@ ip_rfc1001_connect(struct TCP_Server_Inf
* sessinit is sent but no second negprot
*/
struct rfc1002_session_packet *ses_init_buf;
+ unsigned int req_noscope_len;
struct smb_hdr *smb_buf;
+
ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
GFP_KERNEL);
+
if (ses_init_buf) {
ses_init_buf->trailer.session_req.called_len = 32;
@@ -4051,8 +4054,12 @@ ip_rfc1001_connect(struct TCP_Server_Inf
ses_init_buf->trailer.session_req.scope2 = 0;
smb_buf = (struct smb_hdr *)ses_init_buf;
- /* sizeof RFC1002_SESSION_REQUEST with no scope */
- smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
+ /* sizeof RFC1002_SESSION_REQUEST with no scopes */
+ req_noscope_len = sizeof(struct rfc1002_session_packet) - 2;
+
+ /* == cpu_to_be32(0x81000044) */
+ smb_buf->smb_buf_length =
+ cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | req_noscope_len);
rc = smb_send(server, smb_buf, 0x44);
kfree(ses_init_buf);
/*
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -132,11 +132,6 @@ static void unicode_ssetup_strings(char
/* BB FIXME add check that strings total less
than 335 or will need to send them as arrays */
- /* unicode strings, must be word aligned before the call */
-/* if ((long) bcc_ptr % 2) {
- *bcc_ptr = 0;
- bcc_ptr++;
- } */
/* copy user */
if (ses->user_name == NULL) {
/* null user mount */
@@ -970,7 +965,7 @@ sess_auth_ntlmv2(struct sess_data *sess_
}
if (ses->capabilities & CAP_UNICODE) {
- if (sess_data->iov[0].iov_len % 2) {
+ if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
*bcc_ptr = 0;
bcc_ptr++;
}
@@ -1010,7 +1005,7 @@ sess_auth_ntlmv2(struct sess_data *sess_
/* no string area to decode, do nothing */
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
/* unicode string area must be word-aligned */
- if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+ if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
++bcc_ptr;
--bytes_remaining;
}
@@ -1094,8 +1089,7 @@ sess_auth_kerberos(struct sess_data *ses
if (ses->capabilities & CAP_UNICODE) {
/* unicode strings must be word aligned */
- if ((sess_data->iov[0].iov_len
- + sess_data->iov[1].iov_len) % 2) {
+ if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
*bcc_ptr = 0;
bcc_ptr++;
}
@@ -1146,7 +1140,7 @@ sess_auth_kerberos(struct sess_data *ses
/* no string area to decode, do nothing */
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
/* unicode string area must be word-aligned */
- if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+ if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
++bcc_ptr;
--bytes_remaining;
}
@@ -1197,7 +1191,7 @@ _sess_auth_rawntlmssp_assemble_req(struc
bcc_ptr = sess_data->iov[2].iov_base;
/* unicode strings must be word aligned */
- if ((sess_data->iov[0].iov_len + sess_data->iov[1].iov_len) % 2) {
+ if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
*bcc_ptr = 0;
bcc_ptr++;
}
@@ -1386,7 +1380,7 @@ sess_auth_rawntlmssp_authenticate(struct
/* no string area to decode, do nothing */
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
/* unicode string area must be word-aligned */
- if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+ if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
++bcc_ptr;
--bytes_remaining;
}
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -260,7 +260,7 @@ smb2_check_message(char *buf, unsigned i
* Some windows servers (win2016) will pad also the final
* PDU in a compound to 8 bytes.
*/
- if (((calc_len + 7) & ~7) == len)
+ if (ALIGN(calc_len, 8) == len)
return 0;
/*
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -465,8 +465,7 @@ build_netname_ctxt(struct smb2_netname_n
/* copy up to max of first 100 bytes of server name to NetName field */
pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
/* context size is DataLength + minimal smb2_neg_context */
- return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
- sizeof(struct smb2_neg_context), 8) * 8;
+ return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
}
static void
@@ -510,27 +509,25 @@ assemble_neg_contexts(struct smb2_negoti
* round up total_len of fixed part of SMB3 negotiate request to 8
* byte boundary before adding negotiate contexts
*/
- *total_len = roundup(*total_len, 8);
+ *total_len = ALIGN(*total_len, 8);
pneg_ctxt = (*total_len) + (char *)req;
req->NegotiateContextOffset = cpu_to_le32(*total_len);
build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
- ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
+ ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
- ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
+ ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
if (server->compress_algorithm) {
build_compression_ctxt((struct smb2_compression_capabilities_context *)
pneg_ctxt);
- ctxt_len = DIV_ROUND_UP(
- sizeof(struct smb2_compression_capabilities_context),
- 8) * 8;
+ ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
req->NegotiateContextCount = cpu_to_le16(5);
@@ -661,7 +658,7 @@ static int smb311_decode_neg_context(str
if (rc)
break;
/* offsets must be 8 byte aligned */
- clen = (clen + 7) & ~0x7;
+ clen = ALIGN(clen, 8);
offset += clen + sizeof(struct smb2_neg_context);
len_of_ctxts -= clen;
}
@@ -2226,7 +2223,7 @@ create_sd_buf(umode_t mode, bool set_own
unsigned int group_offset = 0;
struct smb3_acl acl;
- *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
+ *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
if (set_owner) {
/* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
@@ -2300,7 +2297,7 @@ create_sd_buf(umode_t mode, bool set_own
memcpy(aclptr, &acl, sizeof(struct smb3_acl));
buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
- *len = roundup(ptr - (__u8 *)buf, 8);
+ *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
return buf;
}
@@ -2394,7 +2391,7 @@ alloc_path_with_tree_prefix(__le16 **out
* final path needs to be 8-byte aligned as specified in
* MS-SMB2 2.2.13 SMB2 CREATE Request.
*/
- *out_size = roundup(*out_len * sizeof(__le16), 8);
+ *out_size = round_up(*out_len * sizeof(__le16), 8);
*out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
if (!*out_path)
return -ENOMEM;
@@ -2625,9 +2622,7 @@ SMB2_open_init(struct cifs_tcon *tcon, s
uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
/* MUST set path len (NameLength) to 0 opening root of share */
req->NameLength = cpu_to_le16(uni_path_len - 2);
- copy_size = uni_path_len;
- if (copy_size % 8 != 0)
- copy_size = roundup(copy_size, 8);
+ copy_size = round_up(uni_path_len, 8);
copy_path = kzalloc(copy_size, GFP_KERNEL);
if (!copy_path)
return -ENOMEM;
@@ -3801,7 +3796,7 @@ smb2_new_read_req(void **buf, unsigned i
if (request_type & CHAINED_REQUEST) {
if (!(request_type & END_OF_CHAIN)) {
/* next 8-byte aligned request */
- *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
+ *total_len = ALIGN(*total_len, 8);
shdr->NextCommand = cpu_to_le32(*total_len);
} else /* END_OF_CHAIN */
shdr->NextCommand = 0;