linux-kernel - [PATCH 4.19 125/361] wil6210: fix RX buffers release and unmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 11 Nov 2018 14:17:52 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Maya Erez <merez@...eaurora.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 125/361] wil6210: fix RX buffers release and unmap

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Maya Erez <merez@...eaurora.org>

[ Upstream commit 84f16fbb62384fb209cd35741d94eb00b5ca2746 ]

RX SKBs are released in both wil6210 rmmod and RX handle.
As there is no lock to protect the buffers DMA unmap,
the SKB pointer in buff_arr is used to check if the buffer
memory was already released.
Setting wil->rx_buff_mgmt.buff_arr[buff_id].skb to NULL before the DMA
memory unmap will prevent duplicate unmapping of the same memory.
Move the buffer ID to the free list also in case the SKB is NULL.

Signed-off-by: Maya Erez <merez@...eaurora.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/ath/wil6210/txrx_edma.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

--- a/drivers/net/wireless/ath/wil6210/txrx_edma.c
+++ b/drivers/net/wireless/ath/wil6210/txrx_edma.c
@@ -279,9 +279,6 @@ static void wil_move_all_rx_buff_to_free
 		u16 buff_id;
 
 		*d = *_d;
-		pa = wil_rx_desc_get_addr_edma(&d->dma);
-		dmalen = le16_to_cpu(d->dma.length);
-		dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
 
 		/* Extract the SKB from the rx_buff management array */
 		buff_id = __le16_to_cpu(d->mac.buff_id);
@@ -291,10 +288,15 @@ static void wil_move_all_rx_buff_to_free
 		}
 		skb = wil->rx_buff_mgmt.buff_arr[buff_id].skb;
 		wil->rx_buff_mgmt.buff_arr[buff_id].skb = NULL;
-		if (unlikely(!skb))
+		if (unlikely(!skb)) {
 			wil_err(wil, "No Rx skb at buff_id %d\n", buff_id);
-		else
+		} else {
+			pa = wil_rx_desc_get_addr_edma(&d->dma);
+			dmalen = le16_to_cpu(d->dma.length);
+			dma_unmap_single(dev, pa, dmalen, DMA_FROM_DEVICE);
+
 			kfree_skb(skb);
+		}
 
 		/* Move the buffer from the active to the free list */
 		list_move(&wil->rx_buff_mgmt.buff_arr[buff_id].list,
@@ -906,6 +908,9 @@ again:
 	wil->rx_buff_mgmt.buff_arr[buff_id].skb = NULL;
 	if (!skb) {
 		wil_err(wil, "No Rx skb at buff_id %d\n", buff_id);
+		/* Move the buffer from the active list to the free list */
+		list_move(&wil->rx_buff_mgmt.buff_arr[buff_id].list,
+			  &wil->rx_buff_mgmt.free);
 		goto again;
 	}