This is a note to let you know that I've just added the patch titled
batman-adv: Make TT capability changes atomic
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
batman-adv-make-tt-capability-changes-atomic.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ac4eebd48461ec993e7cb614d5afe7df8c72e6b7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@xxxxxxxxx>
Date: Tue, 16 Jun 2015 17:10:24 +0200
Subject: batman-adv: Make TT capability changes atomic
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From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@xxxxxxxxx>
commit ac4eebd48461ec993e7cb614d5afe7df8c72e6b7 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: e17931d1a61d ("batman-adv: introduce capability initialization bitfield")
Signed-off-by: Linus Lüssing <linus.luessing@xxxxxxxxx>
Signed-off-by: Marek Lindner <mareklindner@xxxxxxxxxxxxx>
Signed-off-by: Antonio Quartulli <antonio@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/batman-adv/translation-table.c | 8 +++++---
net/batman-adv/types.h | 4 ++--
2 files changed, 7 insertions(+), 5 deletions(-)
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -15,6 +15,7 @@
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
+#include <linux/bitops.h>
#include "main.h"
#include "translation-table.h"
#include "soft-interface.h"
@@ -1860,7 +1861,7 @@ void batadv_tt_global_del_orig(struct ba
}
spin_unlock_bh(list_lock);
}
- orig_node->capa_initialized &= ~BATADV_ORIG_CAPA_HAS_TT;
+ clear_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
}
static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
@@ -2819,7 +2820,7 @@ static void _batadv_tt_update_changes(st
return;
}
}
- orig_node->capa_initialized |= BATADV_ORIG_CAPA_HAS_TT;
+ set_bit(BATADV_ORIG_CAPA_HAS_TT, &orig_node->capa_initialized);
}
static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
@@ -3321,7 +3322,8 @@ static void batadv_tt_update_orig(struct
bool has_tt_init;
tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
- has_tt_init = orig_node->capa_initialized & BATADV_ORIG_CAPA_HAS_TT;
+ has_tt_init = test_bit(BATADV_ORIG_CAPA_HAS_TT,
+ &orig_node->capa_initialized);
/* orig table not initialised AND first diff is in the OGM OR the ttvn
* increased by one -> we can apply the attached changes
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -257,7 +257,7 @@ struct batadv_orig_node {
struct hlist_node mcast_want_all_ipv6_node;
#endif
unsigned long capabilities;
- uint8_t capa_initialized;
+ unsigned long capa_initialized;
atomic_t last_ttvn;
unsigned char *tt_buff;
int16_t tt_buff_len;
@@ -298,7 +298,7 @@ struct batadv_orig_node {
enum batadv_orig_capabilities {
BATADV_ORIG_CAPA_HAS_DAT,
BATADV_ORIG_CAPA_HAS_NC,
- BATADV_ORIG_CAPA_HAS_TT = BIT(2),
+ BATADV_ORIG_CAPA_HAS_TT,
BATADV_ORIG_CAPA_HAS_MCAST = BIT(3),
};
Patches currently in stable-queue which might be from linus.luessing@xxxxxxxxx are
queue-4.1/batman-adv-fix-potential-synchronization-issues-in-mcast-tvlv-handler.patch
queue-4.1/batman-adv-make-tt-capability-changes-atomic.patch
queue-4.1/batman-adv-make-dat-capability-changes-atomic.patch
queue-4.1/batman-adv-make-nc-capability-changes-atomic.patch
queue-4.1/batman-adv-fix-potentially-broken-skb-network-header-access.patch
queue-4.1/batman-adv-make-mcast-capability-changes-atomic.patch
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