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(parent: fdc6647) | patch
net: check extack._msg before print
authorLi RongQing <lirongqing@baidu.com>
Fri, 3 Aug 2018 07:45:21 +0000 (15:45 +0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 6 Aug 2018 00:24:45 +0000 (17:24 -0700)
commit491081bb24d715b800f01012c55ef1a201397a92
tree5b4432cdf877af3ad989eb12c1d63f481dc89a8btree | snapshot
parentfdc6647a0e16bec6c36e530566e5701805ec9690commit | diff
net: check extack._msg before print

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: 20960eaecfa2b6 ("net: report invalid mtu value via netlink extack")
Signed-off-by: Zhang Yu <zhangyu31@baidu.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/dev.c diff | blob | history
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