From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 521D3606A31C for ; Sun, 8 Nov 2026 10:57:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=5DcrjiyM; dkim=pass (1024-bit key) header.d=seu.edu.cn header.i=@seu.edu.cn header.a=rsa-sha256 header.s=default header.b=Fx2EmbYc DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; bh=cdRs1y/AAehQi9CrjP0m/d+HyxgJqc5pCMHkj04zq68=; b=5DcrjiyMPeocKU /3boJgENyNQdDJNW3ezjqZkKtBwxW9Jf1thogl8NUpbSa0I0s0IKcGgD/Z2UYTBBYQENBVrkRcMX6 062LidLtbwgBTpL7WHpKShhDgw0CgLqm9jG+TIT0OL9xoPKNi48B+HkVqr9q49WxpS6P/islPMngy 4sGdYxUn8TickslJ7hl6SRBrlmOF9f7FozAbm9YXWIWo/8t/92YQdWQ3RihaccmTuOTMpgFyHXeyZ yxphCJqwcvveJukj6wlIaOtvO1FUUsbDC+s4wuUpjJKY1635dmIqROgAk///7SLpBrOYXdn9TV+em u6ke/gbDwLpO6iHE2CkA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQ0a0-0000000G0OI-441y; Sun, 08 Nov 2026 10:56:56 +0000 Received: from mail-m155101.qiye.163.com ([101.71.155.101]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xQ0Zw-0000000G0Mn-27D0; Sun, 08 Nov 2026 10:56:55 +0000 Received: from LAPTOP-99KJFSET (unknown [223.75.64.82]) by smtp.qiye.163.com (Hmail) with ESMTP id 53e3dfddc; Sun, 8 Nov 2026 18:56:45 +0800 (GMT+08:00) From: Hongyan Xu To: Bjorn Helgaas , linux-pci@vger.kernel.org Cc: Marc Zyngier , Daire McNamara , Conor Dooley , Robert Richter , Zhou Wang , Lorenzo Pieralisi , Krzysztof Wilczynski , Manivannan Sadhasivam , Rob Herring , linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Hongyan Xu Subject: [PATCH 2/3] PCI: microchip: Fix ECAM config window use-after-free Date: Sun, 8 Nov 2026 18:56:38 +0800 Message-ID: <20261108105640.875-3-getshell@seu.edu.cn> X-Mailer: git-send-email 2.50.1.windows.1 In-Reply-To: <20261108105640.875-1-getshell@seu.edu.cn> References: <20261108105640.875-1-getshell@seu.edu.cn> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HM-Tid: 0aa1bacdb3b703a1kunm546e4281ce69c X-HM-MType: 10 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWRgWCB1ZQUpXWS1ZQUlXWQ8JGhUIEh9ZQVlCSUlMVklLQk0eHUhIQhpNQlYeHw 5VEwETFhoSFyQUDg9ZV1kYEgtZQVlJSUhVTE5VTU9VQ0lZV1kWGg8SFR0UWUFZT0tIVUpLSUJDQ0 xVSktLVUtZBg++ DKIM-Signature: a=rsa-sha256; b=Fx2EmbYcTelZqH92CqZdzGbSV16vLlYNdGGMORlC5U++gI3ZH1AUWAHr2Cz3rvlORmhI6JeCg5H/hOXkui3QDezjd5OC8NLDl1dMiXTwb6Zhg8YBy4EHCc6hPH7BO9Ltktkobbd2FU/XbjVPVL9t8dWEPqlMFRlZg2X9nb22qPM=; s=default; c=relaxed/relaxed; d=seu.edu.cn; v=1; bh=cdRs1y/AAehQi9CrjP0m/d+HyxgJqc5pCMHkj04zq68=; h=date:mime-version:subject:message-id:from; X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261108_025653_159809_543EC7B6 X-CRM114-Status: UNSURE ( 8.57 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 mc_host_probe() calls pci_host_common_probe() but has no ->remove, so an unbind only runs devres_release_all(): gen_pci_unmap_cfg() -> pci_ecam_free() frees the ECAM config window while the bus tree stays registered - only pci_remove_bus() unlinks a bus, and only pci_host_common_remove() reaches it for a root bus. The next config access is a use-after-free in pci_ecam_map_bus(), which reads cfg->ops->bus_shift. Trigger: overlay rmdir in configfs, not rmmod (builtin_platform_driver()). Fix: add .remove = pci_host_common_remove, as pci-host-generic.c does since commit 01fcb7f777a9 ("PCI: Add support for unbinding the generic PCI host controller"), so pci_remove_root_bus() unlinks the bus before devres frees cfg. Scope: the PLDA IRQ domains it creates are not devres managed and stay unreleased - a separate, pre-existing issue. Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip PolarFire PCIe controller driver") Cc: stable@vger.kernel.org Signed-off-by: Hongyan Xu --- drivers/pci/controller/plda/pcie-microchip-host.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c index 24bbf93b8051..f7b75013d9fc 100644 --- a/drivers/pci/controller/plda/pcie-microchip-host.c +++ b/drivers/pci/controller/plda/pcie-microchip-host.c @@ -821,6 +821,7 @@ MODULE_DEVICE_TABLE(of, mc_pcie_of_match); static struct platform_driver mc_pcie_driver = { .probe = mc_host_probe, + .remove = pci_host_common_remove, .driver = { .name = "microchip-pcie", .of_match_table = mc_pcie_of_match, -- 2.50.1.windows.1