batman-adv: Correct rcu refcounting for gw_node

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It might be possible that 2 threads access the same data in the same
rcu grace period. The first thread calls call_rcu() to decrement the
refcount and free the data while the second thread increases the
refcount to use the data. To avoid this race condition all refcount
operations have to be atomic.

Reported-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>

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This commit is contained in:

Marek Lindner 2011-02-10 14:33:49 +00:00

parent 44524fcdf6

commit 25b6d3c17e

2 changed files with 17 additions and 22 deletions

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41

net/batman-adv/gateway_client.c

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2

net/batman-adv/types.h

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