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Message-Id: <20220926100811.937789679@linuxfoundation.org>
Date: Mon, 26 Sep 2022 12:11:49 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Tianhao Zhao <tizhao@...hat.com>,
Íñigo Huguet <ihuguet@...hat.com>,
Edward Cree <ecree.xilinx@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 120/207] sfc: fix null pointer dereference in efx_hard_start_xmit
From: Íñigo Huguet <ihuguet@...hat.com>
[ Upstream commit 0a242eb2913a4aa3d6fbdb86559f27628e9466f3 ]
Trying to get the channel from the tx_queue variable here is wrong
because we can only be here if tx_queue is NULL, so we shouldn't
dereference it. As the above comment in the code says, this is very
unlikely to happen, but it's wrong anyway so let's fix it.
I hit this issue because of a different bug that caused tx_queue to be
NULL. If that happens, this is the error message that we get here:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
[...]
RIP: 0010:efx_hard_start_xmit+0x153/0x170 [sfc]
Fixes: 12804793b17c ("sfc: decouple TXQ type from label")
Reported-by: Tianhao Zhao <tizhao@...hat.com>
Signed-off-by: Íñigo Huguet <ihuguet@...hat.com>
Acked-by: Edward Cree <ecree.xilinx@...il.com>
Link: https://lore.kernel.org/r/20220914111135.21038-1-ihuguet@redhat.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/net/ethernet/sfc/tx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
index 138bca611341..80ed7f760bd3 100644
--- a/drivers/net/ethernet/sfc/tx.c
+++ b/drivers/net/ethernet/sfc/tx.c
@@ -549,7 +549,7 @@ netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
* previous packets out.
*/
if (!netdev_xmit_more())
- efx_tx_send_pending(tx_queue->channel);
+ efx_tx_send_pending(efx_get_tx_channel(efx, index));
return NETDEV_TX_OK;
}
--
2.35.1
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