net: ipv4: fix rcu lockdep splat due to wrong annotation

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syzbot triggered following splat when strict netlink
validation is enabled:

net/ipv4/devinet.c:1766 suspicious rcu_dereference_check() usage!

This occurs because we hold RTNL mutex, but no rcu read lock.
The second call site holds both, so just switch to the _rtnl variant.

Reported-by: syzbot+bad6e32808a3a97b1515@syzkaller.appspotmail.com
Fixes: 2638eb8b50 ("net: ipv4: provide __rcu annotation for ifa_list")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Florian Westphal 2019-06-03 22:41:44 +02:00 • committed by David S. Miller

parent ae95f9c1a5

commit d3e6e285ff

1 changed files with 1 additions and 1 deletions

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net/ipv4/devinet.c

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