nfs: add error check in nfs_idmap_prepare_message()

Even though the caller of nfs_idmap_prepare_message() checks return
code in their side but it's better to add an error check for match_int()
so that we can avoid unnecessary operations when bad int arg is
detected.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/nfs4idmap.c b/fs/nfs/nfs4idmap.c
index b6f9d84ba19b1a1002cbc22760ab4d84bd396006..cf72169d6c642e706d6cba16bd565a9a2047d29a 100644 (file)
--- a/fs/nfs/nfs4idmap.c
+++ b/fs/nfs/nfs4idmap.c
@@ -516,6 +516,8 @@ static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
        case Opt_find_group:
                im->im_conv = IDMAP_CONV_IDTONAME;
                ret = match_int(&substr, &im->im_id);
+               if (ret)
+                       goto out;
                break;
 
        default: