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=1793829535; b=WZayWcV/6PU+VK3T9zQTqXVsZhvQ73kwoxRUAO5C+TnJkmIQ7DWvcGjUxE31tEW69h+P KmCKy6zfG1957d+YYHkKPl47wuCX35is/Jm5zFtknEz/3LotAnU/J4xNZVBas+lVndwTY J+YvE0JZPfQanKhuGSL0giO0HvyD3Q/WIbAZGfePZpFRuT96Wk6h/GzmGUFcCxt0KGH1L LqQ2U4iKG52vrtb7brKY5uq3EO8m2kYvK08pyNfV94A7/VkoOjEqZdkwh0Iej3pgKjCJg z9RtKYjo5Cx3f1XeQxuMxiUZuBH6EP3N4DIjxiIOQVH8cI3jZzIkiKlQMHImXp0RHbQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793829535; 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=EXp9cNueZ99PjMaxUY7d9npQjQTQWJXjboc51Xj3V7k=; b=kEriS5lv4xIHerEYoljp2wvyJwE16GnELllt4QxmtlPlux7yiNCHFUOhFh8QYIc8Ymjk FDKai2sgZqbA1g9/VI2mCmO1FHXIhZ3925hjVNoAcre3a0zlaN64hxwpCxixhBKBFcO1v d6oEJngBI1G5m1TABC2YGIz1PZwdtF9E/zLn7cZAgaUINd2UHVTnP3pCvqXB66U3+4sOB 159QDEDFFCokwpaK/gnlJtaO6ccXfETEEStYaaO4wYFqGhyXCf7Qb6U/UKwN7O+9B01LK 7Em+SwTORDvxvYnp9sX1zx78s7e/Fm20eaU5yyVdSZMyIJ19K4H4q/uE0RXffKYFHyw== 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=cDzrD3Cc; 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 612B46074FA7; Wed, 4 Nov 2026 21:58:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=cDzrD3Cc Received: by smtp.kernel.org (Postfix) with ESMTPSA id E998E1F00919; Wed, 4 Nov 2026 21:58:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793829535; bh=EXp9cNueZ99PjMaxUY7d9npQjQTQWJXjboc51Xj3V7k=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=cDzrD3Cc5fpdaJXUIK6IP1YmnZn4ojNHXGf3pIhmAb4CLRX7y6gKsZV4Wq5qJS10S /oMzj7jfjVb9Rsmv4RbQi1qjmMXd86+FbkP3IU7nSt1Faoa31g9zMYq4twLUwtcKsb ljVZLUEHtnzTXINm4xltCfTCeFCMxj1uDh+TF+P8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yousef Alhouseen , Sasha Levin Subject: [PATCH 6.18 0188/1005] misc: genwqe: handle a first DMA address of zero Date: Wed, 4 Nov 2026 15:58:41 -0500 Message-ID: <20261104211049.054476244@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261104211043.516122098@linuxfoundation.org> References: <20261104211043.516122098@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-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