mt76: clear skb pointers from rx aggregation reorder buffer during cleanup

[ Upstream commit 9379df2fd9234e3b67a23101c2370c99f6af6d77 ]

During the cleanup of the aggregation session, a rx handler (or release timer)
on another CPU might still hold a pointer to the reorder buffer and could
attempt to release some packets.
Clearing pointers during cleanup avoids a theoretical use-after-free bug here.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/mediatek/mt76/agg-rx.c b/drivers/net/wireless/mediatek/mt76/agg-rx.c
index d44d57e6eb27ae643462a4af6e07cde7a19fee32..97df6b3a472b1c4a138cf836e899f444576d05b1 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/agg-rx.c
+++ b/drivers/net/wireless/mediatek/mt76/agg-rx.c
@@ -278,6 +278,7 @@ static void mt76_rx_aggr_shutdown(struct mt76_dev *dev, struct mt76_rx_tid *tid)
                if (!skb)
                        continue;
 
+               tid->reorder_buf[i] = NULL;
                tid->nframes--;
                dev_kfree_skb(skb);
        }