From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 03DA8284B59; Sun, 7 Sep 2025 20:30:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757277012; cv=none; b=JBBojQFqY4WL6cfXmHlmDO9CyIZHKNeRxj/o3b8taKG6MifjhStHnQCqAZqnCbUXada3ylmSySA7GqdqACthYpkxesfADzCBckR2vzURrjDp8kL/mRi8PUJCXHOmvoKR8zNZO4yjlQnj6Q1g2/IeFVfxKRyaQ7B1LBlgMS/oBxs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757277012; c=relaxed/simple; bh=VA1w/hAgWj7ON8GxW2S4y4lBmQgeMZxE9slGP1v9KW8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=R2sjKBCzzWKQ6+o7W00WeiAlBP0PWC3+ioNHdNtWmkDTTtpwZLY8pRtNAgtUSCMWzI1voQc35tLMRQ2kR+z1MYDpmfpQPVNVwo81Z7RuTaamCf95Gy248UzPAKuWftKCZsi/PuEXC1UPiUJQ/Fad1stsPLIA6htbx0itNHLO49w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=DO2w1/Cz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="DO2w1/Cz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 799D9C4CEF0; Sun, 7 Sep 2025 20:30:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1757277011; bh=VA1w/hAgWj7ON8GxW2S4y4lBmQgeMZxE9slGP1v9KW8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DO2w1/CzZA8CiDhlY7XvfWNzmILr4R/mt/FywVblFyR2cbY3yuhkuuQoUREPL+pID K2lCHfUaz1rSI+y+tKxrJN2U7a4czdxNJkLF5TxL3raprlAmGkLCrH47l+oCmY3PrK lNo044XDp4++e7ttuagQIOCc1RsPMQ3GF0H4SAaY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhen Ni , Paul Menzel , Tony Nguyen , Sasha Levin Subject: [PATCH 6.12 058/175] i40e: Fix potential invalid access when MAC list is empty Date: Sun, 7 Sep 2025 21:57:33 +0200 Message-ID: <20250907195616.210973889@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250907195614.892725141@linuxfoundation.org> References: <20250907195614.892725141@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhen Ni [ Upstream commit a556f06338e1d5a85af0e32ecb46e365547f92b9 ] list_first_entry() never returns NULL - if the list is empty, it still returns a pointer to an invalid object, leading to potential invalid memory access when dereferenced. Fix this by using list_first_entry_or_null instead of list_first_entry. Fixes: e3219ce6a775 ("i40e: Add support for client interface for IWARP driver") Signed-off-by: Zhen Ni Reviewed-by: Paul Menzel Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/i40e/i40e_client.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_client.c b/drivers/net/ethernet/intel/i40e/i40e_client.c index 59263551c3838..0b099e5f48163 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_client.c +++ b/drivers/net/ethernet/intel/i40e/i40e_client.c @@ -359,8 +359,8 @@ static void i40e_client_add_instance(struct i40e_pf *pf) if (i40e_client_get_params(vsi, &cdev->lan_info.params)) goto free_cdev; - mac = list_first_entry(&cdev->lan_info.netdev->dev_addrs.list, - struct netdev_hw_addr, list); + mac = list_first_entry_or_null(&cdev->lan_info.netdev->dev_addrs.list, + struct netdev_hw_addr, list); if (mac) ether_addr_copy(cdev->lan_info.lanmac, mac->addr); else -- 2.50.1