dlm: fix dlm_dir_lookup() handling of too long names

... those can happen and BUG() from DLM_ASSERT() in allocate_direntry() is
not a good way to handle them.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Teigland <teigland@redhat.com>

diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c
index 831050e5bfd59529359904b64cbcb81b215508a0..85defeb64df452068e78044321a98c807c75d687 100644 (file)
--- a/fs/dlm/dir.c
+++ b/fs/dlm/dir.c
@@ -319,6 +319,9 @@ static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
 
        write_unlock(&ls->ls_dirtbl[bucket].lock);
 
+       if (namelen > DLM_RESNAME_MAXLEN)
+               return -EINVAL;
+
        de = kzalloc(sizeof(struct dlm_direntry) + namelen, GFP_KERNEL);
        if (!de)
                return -ENOMEM;