batman-adv: Fix non-atomic bla_claim::backbone_gw access

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The pointer batadv_bla_claim::backbone_gw can be changed at any time.
Therefore, access to it must be protected to ensure that two function
accessing the same backbone_gw are actually accessing the same. This is
especially important when the crc_lock is used or when the backbone_gw of a
claim is exchanged.

Not doing so leads to invalid memory access and/or reference leaks.

Fixes: 23721387c4 ("batman-adv: add basic bridge loop avoidance code")
Fixes: 5a1dd8a477 ("batman-adv: lock crc access in bridge loop avoidance")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

...

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Sven Eckelmann 2016-07-01 15:49:43 +02:00 • committed by Simon Wunderlich

parent 33fbb1f3db

commit 3db0decf11

2 changed files with 90 additions and 23 deletions

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111

net/batman-adv/bridge_loop_avoidance.c

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2

net/batman-adv/types.h

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