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cifs: update calc_size to take a server argument 

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>
This commit is contained in:
Ronnie Sahlberg 2018-04-22 15:30:12 -06:00 committed by Steve French
parent 14547f7d74
commit 9ec672bd17
7 changed files with 16 additions and 14 deletions
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2
fs/cifs/cifsglob.h
View File

@ -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 */

2
fs/cifs/cifsproto.h
View File

@ -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);

2
fs/cifs/misc.c
View File

@ -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",

2
fs/cifs/netmisc.c
View File

@ -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) +

6
fs/cifs/readdir.c
View File

@ -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);

14
fs/cifs/smb2misc.c
View File

@ -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:

2
fs/cifs/smb2proto.h
View File

@ -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);