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smb: client: reduce stack usage in smb2_set_ea()

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Clang warns about exceeded stack frame size

  fs/smb/client/smb2ops.c:1080:1: warning: stack frame size (1432)
  exceeds limit (1024) in 'smb2_set_ea' [-Wframe-larger-than]

Fix this by allocating a structure that will hold most of the large
variables.

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2023-08-17 12:34:13 -03:00 committed by Steve French
parent 933148a47c
commit f4e5ceb6c1
3 changed files with 37 additions and 47 deletions
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13
fs/smb/client/cifsglob.h
View file

@ -2214,4 +2214,17 @@ static inline void cifs_sg_set_buf(struct sg_table *sgtable,
}
}
struct smb2_compound_vars {
struct cifs_open_parms oparms;
struct kvec rsp_iov[3];
struct smb_rqst rqst[3];
struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
struct kvec qi_iov;
struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
struct kvec close_iov;
struct smb2_file_rename_info rename_info;
struct smb2_file_link_info link_info;
};
#endif /* _CIFS_GLOB_H */

21
fs/smb/client/smb2inode.c
View file

@ -35,19 +35,6 @@ free_set_inf_compound(struct smb_rqst *rqst)
SMB2_close_free(&rqst[2]);
}
struct cop_vars {
struct cifs_open_parms oparms;
struct kvec rsp_iov[3];
struct smb_rqst rqst[3];
struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
struct kvec qi_iov[1];
struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
struct kvec close_iov[1];
struct smb2_file_rename_info rename_info;
struct smb2_file_link_info link_info;
};
/*
* note: If cfile is passed, the reference to it is dropped here.
* So make sure that you do not reuse cfile after return from this func.
@ -63,7 +50,7 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
__u8 **extbuf, size_t *extbuflen,
struct kvec *out_iov, int *out_buftype)
{
struct cop_vars *vars = NULL;
struct smb2_compound_vars *vars = NULL;
struct kvec *rsp_iov;
struct smb_rqst *rqst;
int rc;
@ -134,7 +121,7 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
/* Operation */
switch (command) {
case SMB2_OP_QUERY_INFO:
rqst[num_rqst].rq_iov = &vars->qi_iov[0];
rqst[num_rqst].rq_iov = &vars->qi_iov;
rqst[num_rqst].rq_nvec = 1;
if (cfile)
@ -168,7 +155,7 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
full_path);
break;
case SMB2_OP_POSIX_QUERY_INFO:
rqst[num_rqst].rq_iov = &vars->qi_iov[0];
rqst[num_rqst].rq_iov = &vars->qi_iov;
rqst[num_rqst].rq_nvec = 1;
if (cfile)
@ -376,7 +363,7 @@ static int smb2_compound_op(const unsigned int xid, struct cifs_tcon *tcon,
goto after_close;
/* Close */
flags |= CIFS_CP_CREATE_CLOSE_OP;
rqst[num_rqst].rq_iov = &vars->close_iov[0];
rqst[num_rqst].rq_iov = &vars->close_iov;
rqst[num_rqst].rq_nvec = 1;
rc = SMB2_close_init(tcon, server,
&rqst[num_rqst], COMPOUND_FID,

50
fs/smb/client/smb2ops.c
View file

@ -1075,31 +1075,28 @@ smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
return rc;
}
static int
smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
const char *path, const char *ea_name, const void *ea_value,
const __u16 ea_value_len, const struct nls_table *nls_codepage,
struct cifs_sb_info *cifs_sb)
{
struct smb2_compound_vars *vars;
struct cifs_ses *ses = tcon->ses;
struct TCP_Server_Info *server = cifs_pick_channel(ses);
struct smb_rqst *rqst;
struct kvec *rsp_iov;
__le16 *utf16_path = NULL;
int ea_name_len = strlen(ea_name);
int flags = CIFS_CP_CREATE_CLOSE_OP;
int len;
struct smb_rqst rqst[3];
int resp_buftype[3];
struct kvec rsp_iov[3];
struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
struct cifs_open_parms oparms;
__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
struct cifs_fid fid;
struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
unsigned int size[1];
void *data[1];
struct smb2_file_full_ea_info *ea = NULL;
struct kvec close_iov[1];
struct smb2_query_info_rsp *rsp;
int rc, used_len = 0;
@ -1113,9 +1110,14 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
if (!utf16_path)
return -ENOMEM;
memset(rqst, 0, sizeof(rqst));
resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
memset(rsp_iov, 0, sizeof(rsp_iov));
vars = kzalloc(sizeof(*vars), GFP_KERNEL);
if (!vars) {
rc = -ENOMEM;
goto out_free_path;
}
rqst = vars->rqst;
rsp_iov = vars->rsp_iov;
if (ses->server->ops->query_all_EAs) {
if (!ea_value) {
@ -1160,8 +1162,7 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
}
/* Open */
memset(&open_iov, 0, sizeof(open_iov));
rqst[0].rq_iov = open_iov;
rqst[0].rq_iov = vars->open_iov;
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
oparms = (struct cifs_open_parms) {
@ -1181,8 +1182,7 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
/* Set Info */
memset(&si_iov, 0, sizeof(si_iov));
rqst[1].rq_iov = si_iov;
rqst[1].rq_iov = vars->si_iov;
rqst[1].rq_nvec = 1;
len = sizeof(*ea) + ea_name_len + ea_value_len + 1;
@ -1210,10 +1210,8 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
smb2_set_next_command(tcon, &rqst[1]);
smb2_set_related(&rqst[1]);
/* Close */
memset(&close_iov, 0, sizeof(close_iov));
rqst[2].rq_iov = close_iov;
rqst[2].rq_iov = &vars->close_iov;
rqst[2].rq_nvec = 1;
rc = SMB2_close_init(tcon, server,
&rqst[2], COMPOUND_FID, COMPOUND_FID, false);
@ -1228,13 +1226,15 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
sea_exit:
kfree(ea);
kfree(utf16_path);
SMB2_open_free(&rqst[0]);
SMB2_set_info_free(&rqst[1]);
SMB2_close_free(&rqst[2]);
free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
kfree(vars);
out_free_path:
kfree(utf16_path);
return rc;
}
#endif
@ -1445,16 +1445,6 @@ SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
return rc;
}
struct iqi_vars {
struct smb_rqst rqst[3];
struct kvec rsp_iov[3];
struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
struct kvec qi_iov[1];
struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
struct kvec close_iov[1];
};
static int
smb2_ioctl_query_info(const unsigned int xid,
struct cifs_tcon *tcon,
@ -1462,7 +1452,7 @@ smb2_ioctl_query_info(const unsigned int xid,
__le16 *path, int is_dir,
unsigned long p)
{
struct iqi_vars *vars;
struct smb2_compound_vars *vars;
struct smb_rqst *rqst;
struct kvec *rsp_iov;
struct cifs_ses *ses = tcon->ses;
@ -1580,7 +1570,7 @@ smb2_ioctl_query_info(const unsigned int xid,
rc = -EINVAL;
goto free_open_req;
}
rqst[1].rq_iov = &vars->si_iov[0];
rqst[1].rq_iov = vars->si_iov;
rqst[1].rq_nvec = 1;
/* MS-FSCC 2.4.13 FileEndOfFileInformation */
@ -1592,7 +1582,7 @@ smb2_ioctl_query_info(const unsigned int xid,
SMB2_O_INFO_FILE, 0, data, size);
free_req1_func = SMB2_set_info_free;
} else if (qi.flags == PASSTHRU_QUERY_INFO) {
rqst[1].rq_iov = &vars->qi_iov[0];
rqst[1].rq_iov = &vars->qi_iov;
rqst[1].rq_nvec = 1;
rc = SMB2_query_info_init(tcon, server,
@ -1614,7 +1604,7 @@ smb2_ioctl_query_info(const unsigned int xid,
smb2_set_related(&rqst[1]);
/* Close */
rqst[2].rq_iov = &vars->close_iov[0];
rqst[2].rq_iov = &vars->close_iov;
rqst[2].rq_nvec = 1;
rc = SMB2_close_init(tcon, server,