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authorLennert Buytenhek <buytenh@wantstofly.org>2015-07-21 17:44:47 +0300
committerMarcel Holtmann <marcel@holtmann.org>2015-07-30 14:08:55 +0200
commitc22ff7b4e74d8136a9911d8b8d0f25f9f7c3edc1 (patch)
tree172c0937f69b785793e1f2e63776341833c5800b /net/mac802154
parent8b44f0dd2f90acd6c8842537223b39f890f2e713 (diff)
downloadlinux-stericsson-c22ff7b4e74d8136a9911d8b8d0f25f9f7c3edc1.tar.gz
mac802154: Fix memory corruption with global deferred transmit state.
When transmitting a packet via a mac802154 driver that can sleep in its transmit function, mac802154 defers the call to the driver's transmit function to a per-device workqueue. However, mac802154 uses a single global work_struct for this, which means that if you have more than one registered mac802154 interface in the system, and you transmit on more than one of them at the same time, you'll very easily cause memory corruption. This patch moves the deferred transmit processing state from global variables to struct ieee802154_local, and this seems to fix the memory corruption issue. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Acked-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/mac802154')
-rw-r--r--net/mac802154/ieee802154_i.h4
-rw-r--r--net/mac802154/main.c2
-rw-r--r--net/mac802154/tx.c27
3 files changed, 12 insertions, 21 deletions
diff --git a/net/mac802154/ieee802154_i.h b/net/mac802154/ieee802154_i.h
index 6810d7a25aca..56ccffa3f2bf 100644
--- a/net/mac802154/ieee802154_i.h
+++ b/net/mac802154/ieee802154_i.h
@@ -60,6 +60,9 @@ struct ieee802154_local {
struct tasklet_struct tasklet;
struct sk_buff_head skb_queue;
+
+ struct sk_buff *tx_skb;
+ struct work_struct tx_work;
};
enum {
@@ -125,6 +128,7 @@ ieee802154_sdata_running(struct ieee802154_sub_if_data *sdata)
extern struct ieee802154_mlme_ops mac802154_mlme_wpan;
void ieee802154_rx(struct ieee802154_local *local, struct sk_buff *skb);
+void ieee802154_xmit_worker(struct work_struct *work);
netdev_tx_t
ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev);
netdev_tx_t
diff --git a/net/mac802154/main.c b/net/mac802154/main.c
index 91f120845a45..9e55431b9a5c 100644
--- a/net/mac802154/main.c
+++ b/net/mac802154/main.c
@@ -105,6 +105,8 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
skb_queue_head_init(&local->skb_queue);
+ INIT_WORK(&local->tx_work, ieee802154_xmit_worker);
+
/* init supported flags with 802.15.4 default ranges */
phy->supported.max_minbe = 8;
phy->supported.min_maxbe = 3;
diff --git a/net/mac802154/tx.c b/net/mac802154/tx.c
index c62e95695c78..7ed439172f30 100644
--- a/net/mac802154/tx.c
+++ b/net/mac802154/tx.c
@@ -30,23 +30,11 @@
#include "ieee802154_i.h"
#include "driver-ops.h"
-/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
- * packets through the workqueue.
- */
-struct ieee802154_xmit_cb {
- struct sk_buff *skb;
- struct work_struct work;
- struct ieee802154_local *local;
-};
-
-static struct ieee802154_xmit_cb ieee802154_xmit_cb;
-
-static void ieee802154_xmit_worker(struct work_struct *work)
+void ieee802154_xmit_worker(struct work_struct *work)
{
- struct ieee802154_xmit_cb *cb =
- container_of(work, struct ieee802154_xmit_cb, work);
- struct ieee802154_local *local = cb->local;
- struct sk_buff *skb = cb->skb;
+ struct ieee802154_local *local =
+ container_of(work, struct ieee802154_local, tx_work);
+ struct sk_buff *skb = local->tx_skb;
struct net_device *dev = skb->dev;
int res;
@@ -106,11 +94,8 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
} else {
- INIT_WORK(&ieee802154_xmit_cb.work, ieee802154_xmit_worker);
- ieee802154_xmit_cb.skb = skb;
- ieee802154_xmit_cb.local = local;
-
- queue_work(local->workqueue, &ieee802154_xmit_cb.work);
+ local->tx_skb = skb;
+ queue_work(local->workqueue, &local->tx_work);
}
return NETDEV_TX_OK;