net: Convert atomic_t net::count to refcount_t

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Since net could be obtained from RCU lists,
and there is a race with net destruction,
the patch converts net::count to refcount_t.

This provides sanity checks for the cases of
incrementing counter of already dead net,
when maybe_get_net() has to used instead
of get_net().

Drivers: allyesconfig and allmodconfig are OK.

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Kirill Tkhai 2018-01-12 18:28:31 +03:00 • committed by David S. Miller

parent 594831a8ab

commit 273c28bc57

5 changed files with 14 additions and 14 deletions

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8

include/net/net_namespace.h

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