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From: Maya Erez <qca_merez@qca.qualcomm.com>
To: Kalle Valo <kvalo@codeaurora.org>
Cc: Hamad Kadmany <QCA_hkadmany@QCA.qualcomm.com>,
	linux-wireless@vger.kernel.org, wil6210@qca.qualcomm.com,
	Maya Erez <qca_merez@qca.qualcomm.com>,
	Vladimir Kondratiev <QCA_vkondrat@QCA.qualcomm.com>
Subject: [PATCH v1 1/2] wil6210: fix kernel OOPS when stopping interface during Rx traffic
Date: Wed, 16 Dec 2015 17:51:45 +0200	[thread overview]
Message-ID: <1450281106-29416-2-git-send-email-qca_merez@qca.qualcomm.com> (raw)
In-Reply-To: <1450281106-29416-1-git-send-email-qca_merez@qca.qualcomm.com>

From: Hamad Kadmany <qca_hkadmany@qca.qualcomm.com>

When network interface is stopping, some resources may
be already released by the network stack, and Rx frames
cause kernel OOPS (observed one is in netfilter code)

Proper solution is to drop packets pending in reorder buffer.

Signed-off-by: Hamad Kadmany <qca_hkadmany@qca.qualcomm.com>
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
---
 drivers/net/wireless/ath/wil6210/rx_reorder.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/wil6210/rx_reorder.c b/drivers/net/wireless/ath/wil6210/rx_reorder.c
index e3d1be8..32031e7 100644
--- a/drivers/net/wireless/ath/wil6210/rx_reorder.c
+++ b/drivers/net/wireless/ath/wil6210/rx_reorder.c
@@ -261,9 +261,19 @@ struct wil_tid_ampdu_rx *wil_tid_ampdu_rx_alloc(struct wil6210_priv *wil,
 void wil_tid_ampdu_rx_free(struct wil6210_priv *wil,
 			   struct wil_tid_ampdu_rx *r)
 {
+	int i;
+
 	if (!r)
 		return;
-	wil_release_reorder_frames(wil, r, r->head_seq_num + r->buf_size);
+
+	/* Do not pass remaining frames to the network stack - it may be
+	 * not expecting to get any more Rx. Rx from here may lead to
+	 * kernel OOPS since some per-socket accounting info was already
+	 * released.
+	 */
+	for (i = 0; i < r->buf_size; i++)
+		kfree_skb(r->reorder_buf[i]);
+
 	kfree(r->reorder_buf);
 	kfree(r->reorder_time);
 	kfree(r);
-- 
1.8.5.2


  reply	other threads:[~2015-12-16 15:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-16 15:51 [PATCH v1 0/2] wil6210 patches Maya Erez
2015-12-16 15:51 ` Maya Erez [this message]
2015-12-16 15:51 ` [PATCH v1 2/2] wil6210: support for platform specific crash recovery Maya Erez
2015-12-18 13:13 ` [PATCH v1 0/2] wil6210 patches Kalle Valo
2016-01-07 13:01 ` Kalle Valo

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