From: John Fastabend <john.fastabend@gmail.com>
Date: Tue, 15 Aug 2017 23:35:12 -0700
Subject: bpf: devmap: remove unnecessary value size check
Patch-mainline: v4.14-rc1
Git-commit: cf9d01405925e3f8144c99d7bf7b184449794066
References: bsc#1109837

In the devmap alloc map logic we check to ensure that the sizeof the
values are not greater than KMALLOC_MAX_SIZE. But, in the dev map case
we ensure the value size is 4bytes earlier in the function because all
values should be netdev ifindex values.

The second check is harmless but is not needed so remove it.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 kernel/bpf/devmap.c |    6 ------
 1 file changed, 6 deletions(-)

--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -83,12 +83,6 @@ static struct bpf_map *dev_map_alloc(uni
 	    attr->value_size != 4 || attr->map_flags)
 		return ERR_PTR(-EINVAL);
 
-	/* if value_size is bigger, the user space won't be able to
-	 * access the elements.
-	 */
-	if (attr->value_size > KMALLOC_MAX_SIZE)
-		return ERR_PTR(-E2BIG);
-
 	dtab = kzalloc(sizeof(*dtab), GFP_USER);
 	if (!dtab)
 		return ERR_PTR(-ENOMEM);