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cifs: move some variables off the stack in smb2_ioctl_query_info 

Move some large data structures off the stack and into dynamically
allocated memory in the function smb2_ioctl_query_info

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2020-05-21 15:03:15 +10:00 коммит произвёл Steve French
Родитель a7d5c29462
Коммит b2ca6c2c9e
1 изменённых файлов: 35 добавлений и 23 удалений
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58
fs/cifs/smb2ops.c
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@ -1452,6 +1452,16 @@ req_res_key_exit:
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,
@ -1459,6 +1469,9 @@ smb2_ioctl_query_info(const unsigned int xid,
__le16 *path, int is_dir,
unsigned long p)
{
struct iqi_vars *vars;
struct smb_rqst *rqst;
struct kvec *rsp_iov;
struct cifs_ses *ses = tcon->ses;
char __user *arg = (char __user *)p;
struct smb_query_info qi;
@ -1468,45 +1481,47 @@ smb2_ioctl_query_info(const unsigned int xid,
struct smb2_query_info_rsp *qi_rsp = NULL;
struct smb2_ioctl_rsp *io_rsp = NULL;
void *buffer = NULL;
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 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];
unsigned int size[2];
void *data[2];
int create_options = is_dir ? CREATE_NOT_FILE : CREATE_NOT_DIR;
memset(rqst, 0, sizeof(rqst));
vars = kzalloc(sizeof(*vars), GFP_ATOMIC);
if (vars == NULL)
return -ENOMEM;
rqst = &vars->rqst[0];
rsp_iov = &vars->rsp_iov[0];
resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
memset(rsp_iov, 0, sizeof(rsp_iov));
if (copy_from_user(&qi, arg, sizeof(struct smb_query_info)))
return -EFAULT;
goto e_fault;
if (qi.output_buffer_length > 1024)
if (qi.output_buffer_length > 1024) {
kfree(vars);
return -EINVAL;
}
if (!ses || !(ses->server))
if (!ses || !(ses->server)) {
kfree(vars);
return -EIO;
}
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
buffer = memdup_user(arg + sizeof(struct smb_query_info),
qi.output_buffer_length);
if (IS_ERR(buffer))
if (IS_ERR(buffer)) {
kfree(vars);
return PTR_ERR(buffer);
}
/* Open */
memset(&open_iov, 0, sizeof(open_iov));
rqst[0].rq_iov = open_iov;
rqst[0].rq_iov = &vars->open_iov[0];
rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
memset(&oparms, 0, sizeof(oparms));
@ -1548,8 +1563,7 @@ smb2_ioctl_query_info(const unsigned int xid,
if (!capable(CAP_SYS_ADMIN))
rc = -EPERM;
else {
memset(&io_iov, 0, sizeof(io_iov));
rqst[1].rq_iov = io_iov;
rqst[1].rq_iov = &vars->io_iov[0];
rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
rc = SMB2_ioctl_init(tcon, &rqst[1],
@ -1565,8 +1579,7 @@ smb2_ioctl_query_info(const unsigned int xid,
if (!capable(CAP_SYS_ADMIN))
rc = -EPERM;
else {
memset(&si_iov, 0, sizeof(si_iov));
rqst[1].rq_iov = si_iov;
rqst[1].rq_iov = &vars->si_iov[0];
rqst[1].rq_nvec = 1;
size[0] = 8;
@ -1579,8 +1592,7 @@ smb2_ioctl_query_info(const unsigned int xid,
SMB2_O_INFO_FILE, 0, data, size);
}
} else if (qi.flags == PASSTHRU_QUERY_INFO) {
memset(&qi_iov, 0, sizeof(qi_iov));
rqst[1].rq_iov = qi_iov;
rqst[1].rq_iov = &vars->qi_iov[0];
rqst[1].rq_nvec = 1;
rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
@ -1599,8 +1611,7 @@ smb2_ioctl_query_info(const unsigned int xid,
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[0];
rqst[2].rq_nvec = 1;
rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
@ -1649,6 +1660,7 @@ smb2_ioctl_query_info(const unsigned int xid,
}
iqinf_exit:
kfree(vars);
kfree(buffer);
SMB2_open_free(&rqst[0]);
if (qi.flags & PASSTHRU_FSCTL)