From: Li RongQing
Date: Fri, 3 Aug 2018 15:45:21 +0800
> dev_set_mtu_ext is able to fail with a valid mtu value, at that
> condition, extack._msg is not set and random since it is in stack,
> then kernel will crash when print it.
>
> Fixes: 7a4c53bee3324a ("net: report invalid mtu value via net
dev_set_mtu_ext is able to fail with a valid mtu value, at that
condition, extack._msg is not set and random since it is in stack,
then kernel will crash when print it.
Fixes: 7a4c53bee3324a ("net: report invalid mtu value via netlink extack")
Signed-off-by: Zhang Yu
Signed-off-by: Li RongQing
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