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authorSachin Prabhu <sprabhu@redhat.com>2016-12-15 12:31:19 +0530
committerSteve French <smfrench@gmail.com>2016-12-15 01:42:54 -0600
commit374402a2a1dfbbee8ab1a5a32ec4887bf8c15d52 (patch)
treee886fc71908f5e2ac4c97b68e30e7b364417cfb2 /fs
parent395664439c4945e4827543e3ca80f7b74e1bf733 (diff)
downloadlinux-374402a2a1dfbbee8ab1a5a32ec4887bf8c15d52.tar.bz2
cifs_get_root shouldn't use path with tree name
When a server returns the optional flag SMB_SHARE_IS_IN_DFS in response to a tree connect, cifs_build_path_to_root() will return a pathname which includes the hostname. This causes problems with cifs_get_root() which separates each component and does a lookup for each component of the path which in this case will incorrectly include looking up the hostname component as a path component. We encountered a problem with dfs shares hosted by a Netapp. When connecting to nodes pointed to by the DFS share. The tree connect for these nodes return SMB_SHARE_IS_IN_DFS resulting failures in lookup in cifs_get_root(). RH bz: 1373153 The patch was tested against a Netapp simulator and by a user using an actual Netapp server. Signed-off-by: Sachin Prabhu <sprabhu@redhat.com> Reported-by: Pierguido Lambri <plambri@redhat.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsfs.c2
-rw-r--r--fs/cifs/cifsproto.h3
-rw-r--r--fs/cifs/connect.c3
-rw-r--r--fs/cifs/dir.c4
4 files changed, 7 insertions, 5 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 15261ba464c5..f135f088cdff 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -615,7 +615,7 @@ cifs_get_root(struct smb_vol *vol, struct super_block *sb)
return dget(sb->s_root);
full_path = cifs_build_path_to_root(vol, cifs_sb,
- cifs_sb_master_tcon(cifs_sb));
+ cifs_sb_master_tcon(cifs_sb), 0);
if (full_path == NULL)
return ERR_PTR(-ENOMEM);
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index cd8025a249bb..c7b3c841e660 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -63,7 +63,8 @@ extern void exit_cifs_spnego(void);
extern char *build_path_from_dentry(struct dentry *);
extern char *cifs_build_path_to_root(struct smb_vol *vol,
struct cifs_sb_info *cifs_sb,
- struct cifs_tcon *tcon);
+ struct cifs_tcon *tcon,
+ int add_treename);
extern char *build_wildcard_path_from_dentry(struct dentry *direntry);
extern char *cifs_compose_mount_options(const char *sb_mountdata,
const char *fullpath, const struct dfs_info3_param *ref,
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 1847aa8390ff..851256e99cf0 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3765,7 +3765,8 @@ remote_path_check:
/*
* cifs_build_path_to_root works only when we have a valid tcon
*/
- full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
+ full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon,
+ tcon->Flags & SMB_SHARE_IS_IN_DFS);
if (full_path == NULL) {
rc = -ENOMEM;
goto mount_fail_check;
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 789ff1df2d8d..2c227a99f369 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -47,7 +47,7 @@ renew_parental_timestamps(struct dentry *direntry)
char *
cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
- struct cifs_tcon *tcon)
+ struct cifs_tcon *tcon, int add_treename)
{
int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0;
int dfsplen;
@@ -59,7 +59,7 @@ cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
return full_path;
}
- if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
+ if (add_treename)
dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
else
dfsplen = 0;