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| author | Paulo Alcantara <pc@manguebit.com> | 2023-08-17 18:34:15 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2023-08-21 00:05:50 +0300 |
| commit | 74e01332d9585b8252c16c1da055828dc5a5dac9 (patch) | |
| tree | 13b8dfc0393bada258e94496534ee7dbd0f9ec6f /fs/smb/client | |
| parent | b9148756d3e71591f95861ea7e037f8f89f9d594 (diff) | |
| download | linux-74e01332d9585b8252c16c1da055828dc5a5dac9.tar.xz | |
smb: client: reduce stack usage in smb2_query_reparse_point()
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>
Diffstat (limited to 'fs/smb/client')
| -rw-r--r-- | fs/smb/client/smb2ops.c | 35 |
1 files changed, 18 insertions, 17 deletions
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 015d13d9054d..38bc92371560 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -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; } |