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 C531026738B; Tue, 21 Oct 2025 19:54:09 +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=1761076449; cv=none; b=iHLNf8nIffPZcQJ0GOnOuaJ2D41Qs9uEy49rrlH3zob5U91ry3ZL5K8ZfRoPJR3kReTwpsHpx0N8FlgHqRTWHMxQ5s7O0j5WAJok/h7RCF2kzeF7c9ESCVvdWK2KjY6gbhwFrl6eVwPRQRC8eOKtTdeyjw9wGdnp2JFt1wAYQBk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761076449; c=relaxed/simple; bh=LZHrH7/XCBsbrCStNMghNcar9g4/QoflSmOWUnFmFTE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YnDA1150o5ql47mA7lsO0i4qsrpgG6EkEbiLIidmVhp2bRdWXBKwNuDNGNyg1rnE78G9AffIM3oJ3VZb502NvZRe5cnAL36N1XTxDkIVcu7IRTeTi1Nv51bp6xQOrQBgvoX6wYGweWmt6CNSNocpIbm0k5Ev9xx6g8Qa4yaoPw4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=oLhSIryG; 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="oLhSIryG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 54570C4CEF5; Tue, 21 Oct 2025 19:54:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1761076449; bh=LZHrH7/XCBsbrCStNMghNcar9g4/QoflSmOWUnFmFTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oLhSIryGRd7UaV7TUCncYFLCQcKYJwLVe0P0Z68Ocl76npghZaEt0zI/Zxaj38O9t CSTopY/PP4uiMl5g8uaFTKl0stxsk56rnrgQZ8TvKjoej4rYtgii7hifL8ojq4Neh5 0XP6W+HWmwpLr0tlvjExxXNFp3R4WHalgB6xiTC0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yeounsu Moon , Simon Horman , "David S. Miller" , Sasha Levin Subject: [PATCH 6.6 037/105] net: dlink: handle dma_map_single() failure properly Date: Tue, 21 Oct 2025 21:50:46 +0200 Message-ID: <20251021195022.572694947@linuxfoundation.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251021195021.492915002@linuxfoundation.org> References: <20251021195021.492915002@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yeounsu Moon [ Upstream commit 65946eac6d888d50ae527c4e5c237dbe5cc3a2f2 ] There is no error handling for `dma_map_single()` failures. Add error handling by checking `dma_mapping_error()` and freeing the `skb` using `dev_kfree_skb()` (process context) when it fails. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Yeounsu Moon Tested-on: D-Link DGE-550T Rev-A3 Suggested-by: Simon Horman Reviewed-by: Simon Horman Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/dlink/dl2k.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/dlink/dl2k.c b/drivers/net/ethernet/dlink/dl2k.c index 1c3a5cf379cd0..72c97dcd0fee0 100644 --- a/drivers/net/ethernet/dlink/dl2k.c +++ b/drivers/net/ethernet/dlink/dl2k.c @@ -498,25 +498,34 @@ static int alloc_list(struct net_device *dev) for (i = 0; i < RX_RING_SIZE; i++) { /* Allocated fixed size of skbuff */ struct sk_buff *skb; + dma_addr_t addr; skb = netdev_alloc_skb_ip_align(dev, np->rx_buf_sz); np->rx_skbuff[i] = skb; - if (!skb) { - free_list(dev); - return -ENOMEM; - } + if (!skb) + goto err_free_list; + + addr = dma_map_single(&np->pdev->dev, skb->data, + np->rx_buf_sz, DMA_FROM_DEVICE); + if (dma_mapping_error(&np->pdev->dev, addr)) + goto err_kfree_skb; np->rx_ring[i].next_desc = cpu_to_le64(np->rx_ring_dma + ((i + 1) % RX_RING_SIZE) * sizeof(struct netdev_desc)); /* Rubicon now supports 40 bits of addressing space. */ - np->rx_ring[i].fraginfo = - cpu_to_le64(dma_map_single(&np->pdev->dev, skb->data, - np->rx_buf_sz, DMA_FROM_DEVICE)); + np->rx_ring[i].fraginfo = cpu_to_le64(addr); np->rx_ring[i].fraginfo |= cpu_to_le64((u64)np->rx_buf_sz << 48); } return 0; + +err_kfree_skb: + dev_kfree_skb(np->rx_skbuff[i]); + np->rx_skbuff[i] = NULL; +err_free_list: + free_list(dev); + return -ENOMEM; } static void rio_hw_init(struct net_device *dev) -- 2.51.0