From 750b8de6c4277d7034061e1da50663aa1b0479e4 Mon Sep 17 00:00:00 2001 From: Sachin Prabhu Date: Mon, 25 Nov 2013 17:09:48 +0000 Subject: cifs: We do not drop reference to tlink in CIFSCheckMFSymlink() When we obtain tcon from cifs_sb, we use cifs_sb_tlink() to first obtain tlink which also grabs a reference to it. We do not drop this reference to tlink once we are done with the call. The patch fixes this issue by instead passing tcon as a parameter and avoids having to obtain a reference to the tlink. A lookup for the tcon is already made in the calling functions and this way we avoid having to re-run the lookup. This is also consistent with the argument list for other similar calls for M-F symlinks. We should also return an ENOSYS when we do not find a protocol specific function to lookup the MF Symlink data. Signed-off-by: Sachin Prabhu Reviewed-by: Jeff Layton CC: Stable Signed-off-by: Steve French --- fs/cifs/link.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-) (limited to 'fs/cifs/link.c') diff --git a/fs/cifs/link.c b/fs/cifs/link.c index cc023471..92aee08 100644 --- a/fs/cifs/link.c +++ b/fs/cifs/link.c @@ -354,34 +354,30 @@ open_query_close_cifs_symlink(const unsigned char *path, char *pbuf, int -CIFSCheckMFSymlink(struct cifs_fattr *fattr, - const unsigned char *path, - struct cifs_sb_info *cifs_sb, unsigned int xid) +CIFSCheckMFSymlink(unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, + const unsigned char *path) { - int rc = 0; + int rc; u8 *buf = NULL; unsigned int link_len = 0; unsigned int bytes_read = 0; - struct cifs_tcon *ptcon; if (!CIFSCouldBeMFSymlink(fattr)) /* it's not a symlink */ return 0; buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); - if (!buf) { - rc = -ENOMEM; - goto out; - } + if (!buf) + return -ENOMEM; - ptcon = tlink_tcon(cifs_sb_tlink(cifs_sb)); - if ((ptcon->ses) && (ptcon->ses->server->ops->query_mf_symlink)) - rc = ptcon->ses->server->ops->query_mf_symlink(path, buf, - &bytes_read, cifs_sb, xid); + if (tcon->ses->server->ops->query_mf_symlink) + rc = tcon->ses->server->ops->query_mf_symlink(path, buf, + &bytes_read, cifs_sb, xid); else - goto out; + rc = -ENOSYS; - if (rc != 0) + if (rc) goto out; if (bytes_read == 0) /* not a symlink */ -- cgit v1.1