From: Ronnie Sahlberg <lsahlber@redhat.com>
Date: Sun, 22 Apr 2018 15:30:12 -0600
Subject: [PATCH] cifs: update calc_size to take a server argument
Git-commit: 9ec672bd17131fe26c966960a573a76fdb1da323
Patch-mainline: v4.17
References: bsc#1144333
and change the smb2 version to take heder_preamble_size into account
instead of hardcoding it as 4 bytes.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Acked-by: Aurelien Aptel <aaptel@suse.com>
---
fs/cifs/cifsglob.h | 2 +-
fs/cifs/cifsproto.h | 2 +-
fs/cifs/misc.c | 2 +-
fs/cifs/netmisc.c | 2 +-
fs/cifs/readdir.c | 6 ++++--
fs/cifs/smb2misc.c | 14 +++++++-------
fs/cifs/smb2proto.h | 2 +-
7 files changed, 16 insertions(+), 14 deletions(-)
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 0e2b145aba46..d71585025ef6 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -372,7 +372,7 @@ struct smb_version_operations {
int (*close_dir)(const unsigned int, struct cifs_tcon *,
struct cifs_fid *);
/* calculate a size of SMB message */
- unsigned int (*calc_smb_size)(void *);
+ unsigned int (*calc_smb_size)(void *buf, struct TCP_Server_Info *ptcpi);
/* check for STATUS_PENDING and process it in a positive case */
bool (*is_status_pending)(char *, struct TCP_Server_Info *, int);
/* check for STATUS_NETWORK_SESSION_EXPIRED */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 365a414a75e9..6c4da5de1ab5 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -124,7 +124,7 @@ extern void cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
unsigned int bytes_written);
extern struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *, bool);
extern struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *, bool);
-extern unsigned int smbCalcSize(void *buf);
+extern unsigned int smbCalcSize(void *buf, struct TCP_Server_Info *server);
extern int decode_negTokenInit(unsigned char *security_blob, int length,
struct TCP_Server_Info *server);
extern int cifs_convert_address(struct sockaddr *dst, const char *src, int len);
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 247a59774b7f..96849b530e32 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -342,7 +342,7 @@ checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server)
/* otherwise, there is enough to get to the BCC */
if (check_smb_hdr(smb))
return -EIO;
- clc_len = smbCalcSize(smb);
+ clc_len = smbCalcSize(smb, server);
if (4 + rfclen != total_read) {
cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n",
diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index cc88f4f0325e..d7ad0dfe4e68 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -903,7 +903,7 @@ map_smb_to_linux_error(char *buf, bool logErr)
* portion, the number of word parameters and the data portion of the message
*/
unsigned int
-smbCalcSize(void *buf)
+smbCalcSize(void *buf, struct TCP_Server_Info *server)
{
struct smb_hdr *ptr = (struct smb_hdr *)buf;
return (sizeof(struct smb_hdr) + (2 * ptr->WordCount) +
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index a27fc8791551..eeab81c9452f 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -650,7 +650,8 @@ find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
char *cur_ent;
char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
server->ops->calc_smb_size(
- cfile->srch_inf.ntwrk_buf_start);
+ cfile->srch_inf.ntwrk_buf_start,
+ server);
cur_ent = cfile->srch_inf.srch_entries_start;
first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
@@ -831,7 +832,8 @@ int cifs_readdir(struct file *file, struct dir_context *ctx)
cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
max_len = tcon->ses->server->ops->calc_smb_size(
- cifsFile->srch_inf.ntwrk_buf_start);
+ cifsFile->srch_inf.ntwrk_buf_start,
+ tcon->ses->server);
end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
index 68ea8491c160..f7f3ad760401 100644
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -233,7 +233,7 @@ smb2_check_message(char *buf, unsigned int length, struct TCP_Server_Info *srvr)
return 1;
}
- clc_len = smb2_calc_size(hdr);
+ clc_len = smb2_calc_size(hdr, srvr);
#ifdef CONFIG_CIFS_SMB311
if (shdr->Command == SMB2_NEGOTIATE)
@@ -403,7 +403,7 @@ smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
* portion, the number of word parameters and the data portion of the message.
*/
unsigned int
-smb2_calc_size(void *buf)
+smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
{
struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
struct smb2_hdr *hdr = &pdu->hdr;
@@ -411,7 +411,7 @@ smb2_calc_size(void *buf)
int offset; /* the offset from the beginning of SMB to data area */
int data_length; /* the length of the variable length data area */
/* Structure Size has already been checked to make sure it is 64 */
- int len = 4 + le16_to_cpu(shdr->StructureSize);
+ int len = srvr->vals->header_preamble_size + le16_to_cpu(shdr->StructureSize);
/*
* StructureSize2, ie length of fixed parameter area has already
@@ -433,12 +433,12 @@ smb2_calc_size(void *buf)
* so we must add one to the calculation (and 4 to account for
* the size of the RFC1001 hdr.
*/
- if (offset + 4 + 1 < len) {
- cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
- offset + 4 + 1, len);
+ if (offset + srvr->vals->header_preamble_size + 1 < len) {
+ cifs_dbg(VFS, "data area offset %zu overlaps SMB2 header %d\n",
+ offset + srvr->vals->header_preamble_size + 1, len);
data_length = 0;
} else {
- len = 4 + offset + data_length;
+ len = srvr->vals->header_preamble_size + offset + data_length;
}
}
calc_size_exit:
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 800270b729e2..8d7bb9a1dcb4 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -36,7 +36,7 @@ struct smb_rqst;
extern int map_smb2_to_linux_error(char *buf, bool log_err);
extern int smb2_check_message(char *buf, unsigned int length,
struct TCP_Server_Info *server);
-extern unsigned int smb2_calc_size(void *buf);
+extern unsigned int smb2_calc_size(void *buf, struct TCP_Server_Info *server);
extern char *smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr);
extern __le16 *cifs_convert_path_to_utf16(const char *from,
struct cifs_sb_info *cifs_sb);
--
2.16.4