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 6500D2DC32B; Tue, 22 Jul 2025 13:54:25 +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=1753192465; cv=none; b=f8Fczq15A0rWFGl7oDu9d3Q2etKABkDfUxsbT07GSKgvzrq1/TBpsXUt2Lb4yaqVZGmpcoTQjD5yp8tqxmrsxps/+n1f6faM0ozbTUwLPCOrn4fz3h8KyrfUMx+zqarG8p4bRzMr1kVLwsKn8dCmDnn9m3+TyT1takCnod39VN8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753192465; c=relaxed/simple; bh=vs6/+OZEsUhnEk8iA30oubQtfVBT5tVhSWIqIBUrm8s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=q3vvDMQ+iVU/xht+HLVjip249W7SeTTbC8GJ2bTdeX3kYOE8/OpVU/N7VQb9fg8ljNoVZID0y5AjvDGSt7qZnycdyyi8+Bk4ta/kFsloXTTP1fpwNezjxBnWx2RBECdb70lKajuxsvQvljpXTm1NTo0eDkp7dy92iuCjAFZD05U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nzH+X1/u; 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="nzH+X1/u" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0E85C4CEEB; Tue, 22 Jul 2025 13:54:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1753192465; bh=vs6/+OZEsUhnEk8iA30oubQtfVBT5tVhSWIqIBUrm8s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nzH+X1/ubGZcS5C7+kful0EQq9WeJB3to6PBNgnGtwO6wRj1AMxQ0KzkPbRu4eCzG sQVHCo01eoTWsWSZld/ZfWHZa64TZUnd63Kwr8gfspgyNmW2PFcEuEVOYKqDDeNjNR usQxPoNUL3OkwMXuy2mMypEu6iHuLsPH4fMKxoz0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jiawen Wu , Simon Horman , Jakub Kicinski Subject: [PATCH 6.6 040/111] net: libwx: fix the using of Rx buffer DMA Date: Tue, 22 Jul 2025 15:44:15 +0200 Message-ID: <20250722134334.892325321@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250722134333.375479548@linuxfoundation.org> References: <20250722134333.375479548@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiawen Wu commit 5fd77cc6bd9b368431a815a780e407b7781bcca0 upstream. The wx_rx_buffer structure contained two DMA address fields: 'dma' and 'page_dma'. However, only 'page_dma' was actually initialized and used to program the Rx descriptor. But 'dma' was uninitialized and used in some paths. This could lead to undefined behavior, including DMA errors or use-after-free, if the uninitialized 'dma' was used. Althrough such error has not yet occurred, it is worth fixing in the code. Fixes: 3c47e8ae113a ("net: libwx: Support to receive packets in NAPI") Cc: stable@vger.kernel.org Signed-off-by: Jiawen Wu Reviewed-by: Simon Horman Link: https://patch.msgid.link/20250714024755.17512-3-jiawenwu@trustnetic.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/wangxun/libwx/wx_lib.c | 4 ++-- drivers/net/ethernet/wangxun/libwx/wx_type.h | 1 - 2 files changed, 2 insertions(+), 3 deletions(-) --- a/drivers/net/ethernet/wangxun/libwx/wx_lib.c +++ b/drivers/net/ethernet/wangxun/libwx/wx_lib.c @@ -307,7 +307,7 @@ static bool wx_alloc_mapped_page(struct return false; dma = page_pool_get_dma_addr(page); - bi->page_dma = dma; + bi->dma = dma; bi->page = page; bi->page_offset = 0; @@ -344,7 +344,7 @@ void wx_alloc_rx_buffers(struct wx_ring DMA_FROM_DEVICE); rx_desc->read.pkt_addr = - cpu_to_le64(bi->page_dma + bi->page_offset); + cpu_to_le64(bi->dma + bi->page_offset); rx_desc++; bi++; --- a/drivers/net/ethernet/wangxun/libwx/wx_type.h +++ b/drivers/net/ethernet/wangxun/libwx/wx_type.h @@ -755,7 +755,6 @@ struct wx_tx_buffer { struct wx_rx_buffer { struct sk_buff *skb; dma_addr_t dma; - dma_addr_t page_dma; struct page *page; unsigned int page_offset; };