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smb: client: reduce stack usage in smb2_query_reparse_point()

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Clang warns about exceeded stack frame size

  fs/smb/client/smb2ops.c:2973:12: warning: stack frame size (1336)
  exceeds limit (1024) in 'smb2_query_reparse_point'
  [-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 12:34:15 -03:00 committed by Steve French
parent b9148756d3
commit 74e01332d9
1 changed files with 18 additions and 17 deletions
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35
fs/smb/client/smb2ops.c
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@ -2965,6 +2965,7 @@ static int smb2_query_reparse_point(const unsigned int xid,
u32 *tag, struct kvec *rsp,
int *rsp_buftype)
{
struct smb2_compound_vars *vars;
int rc;
__le16 *utf16_path = NULL;
__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
@ -2972,12 +2973,9 @@ static int smb2_query_reparse_point(const unsigned int xid,
struct cifs_fid fid;
struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
int flags = CIFS_CP_CREATE_CLOSE_OP;
struct smb_rqst rqst[3];
struct smb_rqst *rqst;
int resp_buftype[3];
struct kvec rsp_iov[3];
struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
struct kvec close_iov[1];
struct kvec *rsp_iov;
struct smb2_ioctl_rsp *ioctl_rsp;
struct reparse_data_buffer *reparse_buf;
u32 plen;
@ -2987,20 +2985,24 @@ static int smb2_query_reparse_point(const unsigned int xid,
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;
memset(rqst, 0, sizeof(rqst));
resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
memset(rsp_iov, 0, sizeof(rsp_iov));
utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
if (!utf16_path)
return -ENOMEM;
resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
vars = kzalloc(sizeof(*vars), GFP_KERNEL);
if (!vars) {
rc = -ENOMEM;
goto out_free_path;
}
rqst = vars->rqst;
rsp_iov = vars->rsp_iov;
/*
* setup smb2open - TODO add optimization to call cifs_get_readable_path
* to see if there is a handle already open that we can use
*/
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) {
@ -3020,8 +3022,7 @@ static int smb2_query_reparse_point(const unsigned int xid,
/* IOCTL */
memset(&io_iov, 0, sizeof(io_iov));
rqst[1].rq_iov = io_iov;
rqst[1].rq_iov = vars->io_iov;
rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
rc = SMB2_ioctl_init(tcon, server,
@ -3036,10 +3037,8 @@ static int smb2_query_reparse_point(const unsigned int xid,
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,
@ -3080,13 +3079,15 @@ static int smb2_query_reparse_point(const unsigned int xid,
}
query_rp_exit:
kfree(utf16_path);
SMB2_open_free(&rqst[0]);
SMB2_ioctl_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;
}