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smb: client: reduce stack usage in smb2_query_info_compound()

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Clang warns about exceeded stack frame size

  fs/smb/client/smb2ops.c:2521:1: warning: stack frame size (1336)
  exceeds limit (1024) in 'smb2_query_info_compound'
  [-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 12:34:14 -03:00 committed by Steve French
parent f4e5ceb6c1
commit b9148756d3
1 changed files with 16 additions and 14 deletions
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30
fs/smb/client/smb2ops.c
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@ -2513,15 +2513,13 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
struct kvec *rsp, int *buftype,
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);
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 qi_iov[1];
struct kvec close_iov[1];
struct kvec *rsp_iov;
u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
struct cifs_open_parms oparms;
struct cifs_fid fid;
@ -2538,9 +2536,14 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
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));
vars = kzalloc(sizeof(*vars), GFP_KERNEL);
if (!vars) {
rc = -ENOMEM;
goto out_free_path;
}
rqst = vars->rqst;
rsp_iov = vars->rsp_iov;
/*
* We can only call this for things we know are directories.
@ -2549,8 +2552,7 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
open_cached_dir(xid, tcon, path, cifs_sb, false,
&cfid); /* cfid null if open dir failed */
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) {
@ -2568,8 +2570,7 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
goto qic_exit;
smb2_set_next_command(tcon, &rqst[0]);
memset(&qi_iov, 0, sizeof(qi_iov));
rqst[1].rq_iov = qi_iov;
rqst[1].rq_iov = &vars->qi_iov;
rqst[1].rq_nvec = 1;
if (cfid) {
@ -2596,8 +2597,7 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
smb2_set_related(&rqst[1]);
}
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,
@ -2628,7 +2628,6 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
*buftype = resp_buftype[1];
qic_exit:
kfree(utf16_path);
SMB2_open_free(&rqst[0]);
SMB2_query_info_free(&rqst[1]);
SMB2_close_free(&rqst[2]);
@ -2636,6 +2635,9 @@ smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
if (cfid)
close_cached_dir(cfid);
kfree(vars);
out_free_path:
kfree(utf16_path);
return rc;
}