3.13.11-ckt28 -stable review patch. If anyone has any objections, please let me know.
------------------ From: =?UTF-8?q?Linus=20L=C3=BCssing?= <[email protected]> commit 4635469f5c617282f18c69643af36cd8c0acf707 upstream. 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()/test_bit() functions. Fixes: 3f4841ffb336 ("batman-adv: tvlv - add network coding container") Signed-off-by: Linus Lüssing <[email protected]> Signed-off-by: Marek Lindner <[email protected]> Signed-off-by: Antonio Quartulli <[email protected]> [ luis: backported to 3.16: adjusted context ] Signed-off-by: Luis Henriques <[email protected]> Signed-off-by: Kamal Mostafa <[email protected]> --- net/batman-adv/network-coding.c | 7 ++++--- net/batman-adv/types.h | 2 +- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c index 511d7e1..71decc0 100644 --- a/net/batman-adv/network-coding.c +++ b/net/batman-adv/network-coding.c @@ -17,6 +17,7 @@ * 02110-1301, USA */ +#include <linux/bitops.h> #include <linux/debugfs.h> #include "main.h" @@ -106,9 +107,9 @@ 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); } /** @@ -860,7 +861,7 @@ void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, goto out; /* check if orig node is network coding enabled */ - if (!(orig_node->capabilities & BATADV_ORIG_CAPA_HAS_NC)) + if (!test_bit(BATADV_ORIG_CAPA_HAS_NC, &orig_node->capabilities)) goto out; /* accept ogms from 'good' neighbors and single hop neighbors */ diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index a235b3b..471bff8 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -259,7 +259,7 @@ struct batadv_orig_node { */ enum batadv_orig_capabilities { BATADV_ORIG_CAPA_HAS_DAT, - BATADV_ORIG_CAPA_HAS_NC = BIT(1), + BATADV_ORIG_CAPA_HAS_NC, }; /** -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
