It's possible that cifs_mount will call cifs_build_path_to_root on a
newly instantiated cifs_sb. In that case, it's likely that the
master_tlink pointer has not yet been instantiated.
Fix this by having cifs_build_path_to_root take a cifsTconInfo pointer
as well, and have the caller pass that in.
Reported-and-Tested-by: Robbert Kouprie <robbert@xxxxxx>
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
---
fs/cifs/cifsproto.h | 3 ++-
fs/cifs/connect.c | 2 +-
fs/cifs/inode.c | 6 +++---
3 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 5523047..e6d1481 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -54,7 +54,8 @@ do { \
__func__, curr_xid, (int)rc); \
} while (0)
extern char *build_path_from_dentry(struct dentry *);
-extern char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb);
+extern char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb,
+ struct cifsTconInfo *tcon);
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 53f9c31..0a203ec 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2833,7 +2833,7 @@ remote_path_check:
/* check if a whole path (including prepath) is not remote */
if (!rc && cifs_sb->prepathlen && tcon) {
/* build_path_to_root works only when we have a valid tcon */
- full_path = cifs_build_path_to_root(cifs_sb);
+ full_path = cifs_build_path_to_root(cifs_sb, tcon);
if (full_path == NULL) {
rc = -ENOMEM;
goto mount_fail_check;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index aa48521..589f3e3 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -728,12 +728,12 @@ static const struct inode_operations cifs_ipc_inode_ops = {
.lookup = cifs_lookup,
};
-char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb)
+char *cifs_build_path_to_root(struct cifs_sb_info *cifs_sb,
+ struct cifsTconInfo *tcon)
{
int pplen = cifs_sb->prepathlen;
int dfsplen;
char *full_path = NULL;
- struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
/* if no prefix path, simply set path to the root of share to "" */
if (pplen == 0) {
@@ -875,7 +875,7 @@ struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
char *full_path;
struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
- full_path = cifs_build_path_to_root(cifs_sb);
+ full_path = cifs_build_path_to_root(cifs_sb, tcon);
if (full_path == NULL)
return ERR_PTR(-ENOMEM);
--
1.7.3.2
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