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 D9F1823F413; Tue, 29 Apr 2025 17:00:14 +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=1745946014; cv=none; b=pWrcv8iwx6Q6GylVpvrF1ma+yh0WTG0VGYvOZC3y2vZhV02DzV03kF0oh0wfZqQ6c+hIcFND03N/sFWGBzC5l25ELXNxUzoE9t283CNRuHKlMAhaleiLDepWa9qhmluph0coep14r8DKN9PegQo9Amdd+/I7MdeTD3PAkf9B9P4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745946014; c=relaxed/simple; bh=j5yFoS3TntcrFv4VVBot6W43S6mK/AV3pKbXypvHpTY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=a59/Q4BY9J4uibi4UUcDkM89Oe4iq0bcW2BiNfiCEuw5esVoVULHMlatIPM1v+XUZiNG8VtukETk+pBUgMu7wjrxJ8VyvpbbAZO6XycbUFJADD5GiuCg8HTaPysVVreBsRf7RAYfWigRsIhu3kPG9m+F6/SivHonfGNXTXS8NRg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=CfXLQXSZ; 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="CfXLQXSZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18441C4CEE3; Tue, 29 Apr 2025 17:00:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745946014; bh=j5yFoS3TntcrFv4VVBot6W43S6mK/AV3pKbXypvHpTY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CfXLQXSZTwKLfKdX/2NzgrjByqYxK1BLY6wLygVKK/B/Y62nni72SY5O6c40cQTyJ sm2LzKei+gL74hHM5ahEztTl8LmHW8XvEgPVNx/cQ8q0aU3OOO6mnGeuFpKynLhzuy hEHIxCV/qJMbCW2j0tJh2HUJUG5zVP4Kq3DVpiA4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Suzuki K Poulose , Thomas Gleixner , Ingo Molnar , Marc Zyngier Subject: [PATCH 6.14 126/311] irqchip/gic-v2m: Prevent use after free of gicv2m_get_fwnode() Date: Tue, 29 Apr 2025 18:39:23 +0200 Message-ID: <20250429161126.198338491@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161121.011111832@linuxfoundation.org> References: <20250429161121.011111832@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 6.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Suzuki K Poulose commit 3318dc299b072a0511d6dfd8367f3304fb6d9827 upstream. With ACPI in place, gicv2m_get_fwnode() is registered with the pci subsystem as pci_msi_get_fwnode_cb(), which may get invoked at runtime during a PCI host bridge probe. But, the call back is wrongly marked as __init, causing it to be freed, while being registered with the PCI subsystem and could trigger: Unable to handle kernel paging request at virtual address ffff8000816c0400 gicv2m_get_fwnode+0x0/0x58 (P) pci_set_bus_msi_domain+0x74/0x88 pci_register_host_bridge+0x194/0x548 This is easily reproducible on a Juno board with ACPI boot. Retain the function for later use. Fixes: 0644b3daca28 ("irqchip/gic-v2m: acpi: Introducing GICv2m ACPI support") Signed-off-by: Suzuki K Poulose Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar Reviewed-by: Marc Zyngier Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/irqchip/irq-gic-v2m.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/irqchip/irq-gic-v2m.c +++ b/drivers/irqchip/irq-gic-v2m.c @@ -423,7 +423,7 @@ static int __init gicv2m_of_init(struct #ifdef CONFIG_ACPI static int acpi_num_msi; -static __init struct fwnode_handle *gicv2m_get_fwnode(struct device *dev) +static struct fwnode_handle *gicv2m_get_fwnode(struct device *dev) { struct v2m_data *data;