From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794060740; b=xj4G2pGJaFJ6dwd9oX1oMdOXoCFIkvKuYCwtDeavQMk+YGj5AMmWTol4nFDEpv7QQbiB nXqfEc2u8aC3foPoejROX9otlnTNvqlZX2DzF2gi7QZ5sNznnM4cD54wcgy3za90GeJXb muoe3IWqudZheh+w3671aasSLCnjM9zja1xwDLSMFE6u+7v7jpcoeO14OTgy/Fcwt0vee zhfaFllfAqTuPFhalEeL3bErW35VbXdZUNI9jNZGFuYSYHLHDl4zMKxNzzzXmnsl1W3MA urEJUbS5QoPMFoIiEev/EjkmcpuUyR8dAwWFBav8r78pr6YBKk86xQi0NWT8iVq//YA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794060740; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=9/NeLg/vglHpBL4kftUcU6tFXjUrvj1OLIeEgeNA5Ao=; b=VEaIDvTbAI5+DBjE14sqynq4uzwTDezhLkthSSmR0gF97BHwcsXtDlXBoNJrQPLvXYde xx3rALHDDsrqsMqsmUVHHcW/cGUQGVWmSoxig9QwVTO/ita104dENbcNVB+lw3FgXoFFd V2ZPLpPZjH9+UuWmXqgiLGyw9kWmi3op5JZWU72ccByEmG9Jg9gNpzSiZL4VMBVMsuUAp mkE+X3QUZrnHQhy8AjtA86Ksjkxwk7mFi1IVHXB18OnNR/XZrlcffuXZ3YoS+Orboc7ww EO27j7F3TW4Agd+RK/3qlKzYx/erm/OY3haIbIvCVvSv4Q5sDMlBEh4VxPJi1tvkCzQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=1rfkI0lR; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A701606A326; Sat, 7 Nov 2026 14:12:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=1rfkI0lR Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0EF581F0089F; Sat, 7 Nov 2026 14:12:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794060740; bh=9/NeLg/vglHpBL4kftUcU6tFXjUrvj1OLIeEgeNA5Ao=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=1rfkI0lRHnwcVYpfTBB7awLAp9xWPaDO2RFFmHujU7zXkXp9AcjEXB48ktsFJxYs8 Ad57dcdVJB6jxJdZ5itJwoJkNjPg8f1v1R/i2D6orRUuZ5ic07/JlhlhruxEnBAJSG luahSE4702f9GbP8Mi4/2FPLtsoKgsv0kDpmNa1I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yousef Alhouseen , Sasha Levin Subject: [PATCH 6.12 0156/1536] misc: genwqe: handle a first DMA address of zero Date: Sat, 7 Nov 2026 08:36:12 -0500 Message-ID: <20261107135002.060716519@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134957.653319350@linuxfoundation.org> References: <20261107134957.653319350@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yousef Alhouseen [ Upstream commit d401772a9e18e837631450844f835229354528a4 ] genwqe_setup_sgl() uses zero as the initial previous DMA address. DMA address zero is valid, so a first entry at that address enters the merge path before last_s has been assigned and dereferences NULL. Only merge adjacent mappings after an SGL data entry has been created. Signed-off-by: Yousef Alhouseen Link: https://patch.msgid.link/20260630104923.53827-1-alhouseenyousef@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/misc/genwqe/card_utils.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/genwqe/card_utils.c b/drivers/misc/genwqe/card_utils.c index a2c4a9b4f871c..e3b5fb337182e 100644 --- a/drivers/misc/genwqe/card_utils.c +++ b/drivers/misc/genwqe/card_utils.c @@ -413,7 +413,7 @@ int genwqe_setup_sgl(struct genwqe_dev *cd, struct genwqe_sgl *sgl, size -= size_to_map; map_offs = 0; - if (prev_daddr == daddr) { + if (last_s && prev_daddr == daddr) { u32 prev_len = be32_to_cpu(last_s->len); /* pr_info("daddr combining: " -- 2.53.0