Repository : ssh://git@open-mesh.org/batman-adv
On branch : maint
commit 586df9e2537b51c0df7ce99576c3cee1681b64de Author: Linus Lüssing linus.luessing@c0d3.blue Date: Tue Jun 16 17:10:23 2015 +0200
batman-adv: Make NC capability changes atomic
Bitwise OR/AND assignments in C aren't guaranteed to be atomic. One OGM handler might undo the set/clear of a specific bit from another handler run in between.
Fix this by using the atomic set_bit()/clear_bit() functions.
Fixes: 7dd9d8992b0c ("batman-adv: tvlv - add network coding container") Signed-off-by: Linus Lüssing linus.luessing@c0d3.blue Signed-off-by: Marek Lindner mareklindner@neomailbox.ch
586df9e2537b51c0df7ce99576c3cee1681b64de network-coding.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/network-coding.c b/network-coding.c index 89e1d47..3ce493e 100644 --- a/network-coding.c +++ b/network-coding.c @@ -105,9 +105,9 @@ static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, uint16_t tvlv_value_len) { if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) - orig->capabilities &= ~BATADV_ORIG_CAPA_HAS_NC; + clear_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); else - orig->capabilities |= BATADV_ORIG_CAPA_HAS_NC; + set_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); }
/**