* [PATCH] mac80211: Fix kernel panic due to use of txq after free
@ 2019-04-16 7:24 ` Bhagavathi Perumal S
0 siblings, 0 replies; 4+ messages in thread
From: Bhagavathi Perumal S @ 2019-04-16 7:24 UTC (permalink / raw)
To: johannes, ath10k, linux-wireless; +Cc: Bhagavathi Perumal S
The txq of vif is added to active_txqs list for ATF TXQ scheduling
in the function ieee80211_queue_skb(), but it was not properly removed
before freeing the txq object. It was causing use after free of the txq
objects from the active_txqs list, result was kernel panic
due to invalid memory access.
Fix kernel invalid memory access by properly removing txq object
from active_txqs list before free the object.
Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
---
net/mac80211/iface.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 94459b2..410685d 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1907,6 +1907,9 @@ void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
list_del_rcu(&sdata->list);
mutex_unlock(&sdata->local->iflist_mtx);
+ if (sdata->vif.txq)
+ ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
+
synchronize_rcu();
if (sdata->dev) {
--
1.9.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] mac80211: Fix kernel panic due to use of txq after free
@ 2019-04-16 7:24 ` Bhagavathi Perumal S
0 siblings, 0 replies; 4+ messages in thread
From: Bhagavathi Perumal S @ 2019-04-16 7:24 UTC (permalink / raw)
To: johannes, ath10k, linux-wireless; +Cc: Bhagavathi Perumal S
The txq of vif is added to active_txqs list for ATF TXQ scheduling
in the function ieee80211_queue_skb(), but it was not properly removed
before freeing the txq object. It was causing use after free of the txq
objects from the active_txqs list, result was kernel panic
due to invalid memory access.
Fix kernel invalid memory access by properly removing txq object
from active_txqs list before free the object.
Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
---
net/mac80211/iface.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 94459b2..410685d 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1907,6 +1907,9 @@ void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
list_del_rcu(&sdata->list);
mutex_unlock(&sdata->local->iflist_mtx);
+ if (sdata->vif.txq)
+ ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
+
synchronize_rcu();
if (sdata->dev) {
--
1.9.1
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] mac80211: Fix kernel panic due to use of txq after free
2019-04-16 7:24 ` Bhagavathi Perumal S
@ 2019-04-16 8:49 ` Toke Høiland-Jørgensen
-1 siblings, 0 replies; 4+ messages in thread
From: Toke Høiland-Jørgensen @ 2019-04-16 8:49 UTC (permalink / raw)
To: Bhagavathi Perumal S, johannes, ath10k, linux-wireless
Cc: Bhagavathi Perumal S
Bhagavathi Perumal S <bperumal@codeaurora.org> writes:
> The txq of vif is added to active_txqs list for ATF TXQ scheduling
> in the function ieee80211_queue_skb(), but it was not properly removed
> before freeing the txq object. It was causing use after free of the txq
> objects from the active_txqs list, result was kernel panic
> due to invalid memory access.
>
> Fix kernel invalid memory access by properly removing txq object
> from active_txqs list before free the object.
>
> Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
Nice catch, thanks!
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
This should probably have a fixes tag:
Fixes: 1866760096bf ("mac80211: Add TXQ scheduling API")
-Toke
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] mac80211: Fix kernel panic due to use of txq after free
@ 2019-04-16 8:49 ` Toke Høiland-Jørgensen
0 siblings, 0 replies; 4+ messages in thread
From: Toke Høiland-Jørgensen @ 2019-04-16 8:49 UTC (permalink / raw)
To: Bhagavathi Perumal S, johannes, ath10k, linux-wireless
Bhagavathi Perumal S <bperumal@codeaurora.org> writes:
> The txq of vif is added to active_txqs list for ATF TXQ scheduling
> in the function ieee80211_queue_skb(), but it was not properly removed
> before freeing the txq object. It was causing use after free of the txq
> objects from the active_txqs list, result was kernel panic
> due to invalid memory access.
>
> Fix kernel invalid memory access by properly removing txq object
> from active_txqs list before free the object.
>
> Signed-off-by: Bhagavathi Perumal S <bperumal@codeaurora.org>
Nice catch, thanks!
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
This should probably have a fixes tag:
Fixes: 1866760096bf ("mac80211: Add TXQ scheduling API")
-Toke
_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2019-04-16 8:49 UTC | newest]
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2019-04-16 7:24 [PATCH] mac80211: Fix kernel panic due to use of txq after free Bhagavathi Perumal S
2019-04-16 7:24 ` Bhagavathi Perumal S
2019-04-16 8:49 ` Toke Høiland-Jørgensen
2019-04-16 8:49 ` Toke Høiland-Jørgensen
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