bpf: devmap: remove unnecessary value size check

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>

diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index 7192fb67d4de5621cbeabc316879d570823cf948..18a72a8add4322817e8f905666e4691e2d25b510 100644 (file)
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -83,12 +83,6 @@ static struct bpf_map *dev_map_alloc(union bpf_attr *attr)
            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);