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    Subject[34-longterm 055/196] cifs: always do is_path_accessible check in cifs_mount
    From: Jeff Layton <>

    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.

    commit 70945643722ffeac779d2529a348f99567fa5c33 upstream.

    Currently, we skip doing the is_path_accessible check in cifs_mount if
    there is no prefixpath. I have a report of at least one server however
    that allows a TREE_CONNECT to a share that has a DFS referral at its
    root. The reporter in this case was using a UNC that had no prefixpath,
    so the is_path_accessible check was not triggered and the box later hit
    a BUG() because we were chasing a DFS referral on the root dentry for
    the mount.

    This patch fixes this by removing the check for a zero-length
    prefixpath. That should make the is_path_accessible check be done in
    this situation and should allow the client to chase the DFS referral at
    mount time instead.

    Reported-and-Tested-by: Yogesh Sharma <>
    Signed-off-by: Jeff Layton <>
    Signed-off-by: Steve French <>
    Signed-off-by: Paul Gortmaker <>
    fs/cifs/connect.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
    index d9566bf..f6afb59 100644
    --- a/fs/cifs/connect.c
    +++ b/fs/cifs/connect.c
    @@ -2555,7 +2555,7 @@ try_mount_again:

    /* check if a whole path (including prepath) is not remote */
    - if (!rc && cifs_sb->prepathlen && tcon) {
    + if (!rc && tcon) {
    /* build_path_to_root works only when we have a valid tcon */
    full_path = cifs_build_path_to_root(cifs_sb);
    if (full_path == NULL) {

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