From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79470C32771 for ; Mon, 26 Sep 2022 11:48:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238915AbiIZLsY (ORCPT ); Mon, 26 Sep 2022 07:48:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54416 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238393AbiIZLqC (ORCPT ); Mon, 26 Sep 2022 07:46:02 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 337C774346; Mon, 26 Sep 2022 03:47:35 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E2E4E60BAA; Mon, 26 Sep 2022 10:47:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F2A78C433C1; Mon, 26 Sep 2022 10:47:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1664189242; bh=DsKjnZ4x2S6AWzYKSIX0+p/vijGEZh6XriUnf40hdao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AohMUNLZACJ0kMQph38boMS0RApKkS1gAkSvATT7Q5M3w+Rlk6+nckPrD3pEdjxtf HIhdOYbYZK7Sr78iAM7wsCZVdFVxBinouBO3C6exSwYs+EXMxivX9RtS8q2nyK6oP0 NI4iTdWppWLQLcYqFjr9UxwRcBroAE01KGEPMuIA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tianhao Zhao , =?UTF-8?q?=C3=8D=C3=B1igo=20Huguet?= , Edward Cree , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.19 120/207] sfc: fix null pointer dereference in efx_hard_start_xmit Date: Mon, 26 Sep 2022 12:11:49 +0200 Message-Id: <20220926100811.937789679@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220926100806.522017616@linuxfoundation.org> References: <20220926100806.522017616@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Íñigo Huguet [ 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 Signed-off-by: Íñigo Huguet Acked-by: Edward Cree Link: https://lore.kernel.org/r/20220914111135.21038-1-ihuguet@redhat.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- 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