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=1794061996; b=yXTQK/PI5YUepsvE+FqNtrUxzLy2FugeDxHFYCf8wmj2D+BncKRoV6Pkwh3AULjWUcud fYx6/NYfzy7Rj5qsb6KOh6R3b8mSsQwX4nRaV5pnLY9Ph4WK90cZuHVlRXlEgv4VN/fbz t7qVk6tPEgZPzy9/mrj8Rf9w1adG1Ente8v34bHlS7Hg2xJXDv6djmmRqzF2yaoyQpA/B iD1cMI/ECMJ7z1oDE1mraehmHwvZKgMfxXwohXh3ItWnhlS0DNFeIBpGuB7cQNKO/Z0ba 6srL/Bsm/5YI/15QANAWtv7pkeyA2QyvCT09x2LWqvxjExVW2VDOT12qWpsR8Ug3agg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794061996; 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=6ZIhDbNyvEY8PmaQFrLODUvpMksTFcRvzFDUf/K7uy0=; b=HfAV09kb2X3DflItlxRPi1oR7Ll6T9x/jv8WOTndhn+dax+2WM+Ft5aneMeDRWvBLviL lGXqcvAH8lM4gzDsCeLpaiX27lHt5vz0TYyEJtMpEoEUuDVVIQ81ASXbs+YWN5JsnBJA/ M+r5RMyhhnmhKo5umioaRmQa6d3qvMeJkTYkkr+S7qVVTlTIVkZlzxHwqaY5T9FvfHGNt EW81WWahmfKHj4pnPs3vwJTjjh8kxOynzn4j/9vTjRBDo4MgccVSWvUNwYdpRconV8P+2 DVpiNVAbStwC4oR5iwUr2nfbIRfr9EUQTJMmiuZN3kYdfl+rSxdYgMGmVq4WmSSW6Vw== 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=W6ihZOX6; 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 6C82A606A32E; Sat, 7 Nov 2026 14:33:16 +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=W6ihZOX6 Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC1D71F0089F; Sat, 7 Nov 2026 14:33:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794061996; bh=6ZIhDbNyvEY8PmaQFrLODUvpMksTFcRvzFDUf/K7uy0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=W6ihZOX6LeAwT6f//t3+jdkk9V/Vl3y9K+RhSLhFfXcLxcUulM6XUPH0FmNncsUhc gCQ/UHeVH/YR497mzeVxZcAZfmpeGQDk/Xv2jvRvGCo4yM3mIlszu1ZrQiGq69CnsR q934Gm7X0w9yA9pw1GFd6XQSjmsZJMWon42MqrDc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Damien Le Moal , Niklas Cassel , Sasha Levin Subject: [PATCH 6.12 0986/1536] ata: libahci: Free the IRQs when activating a multi-IRQ host fails Date: Sat, 7 Nov 2026 08:50:02 -0500 Message-ID: <20261107135025.350408201@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: Niklas Cassel [ Upstream commit 34a4a34431ed81d85d14f8fb8035e5a25214ad39 ] ahci_host_activate_multi_irqs() requests one IRQ per port, but it does not free them when requesting one of them, or when registering the host, fails. The IRQs are only freed by the driver core, when it releases the devres of the device after probe() has returned, while the caller of ahci_host_activate() releases the resources of the host in its probe() error path, e.g. ahci_probe() disables the clocks, regulators, resets and PHYs of the host. An IRQ handler running in that window would access the MMIO of a host which is no longer clocked. ahci_host_activate_multi_irqs() did free the IRQs until commit 0a142b26921c ("ahci: cleanup ahci_host_activate_multi_irqs"), which removed the explicit free because devm makes it unnecessary. That is true for freeing the IRQs as such, but not for the window described above: devres is only released after probe() has returned, i.e. after the error path of the caller has released the resources of the host. Note that this window cannot be hit with the current users: the only user of AHCI_HFLAG_MULTI_MSI is the AHCI PCI driver, which does not release any resource in its probe() error path, and the ports of the host are still frozen, i.e. their interrupts are masked, when ata_host_register() fails. Free the IRQs explicitly again, like ata_host_activate() does, so that the IRQ handlers cannot run once ahci_host_activate() has failed. Fixes: 0a142b26921c ("ahci: cleanup ahci_host_activate_multi_irqs") Cc: stable@vger.kernel.org Reviewed-by: Damien Le Moal Link: https://lore.kernel.org/r/20260915084127.692494-12-cassel@kernel.org Signed-off-by: Niklas Cassel Signed-off-by: Sasha Levin --- drivers/ata/libahci.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 0a8a48384f17f..3084127abd90d 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -2739,11 +2739,33 @@ static int ahci_host_activate_multi_irqs(struct ata_host *host, 0, pp->irq_desc, host->ports[i]); if (rc) - return rc; + goto free_irqs; ata_port_desc_misc(host->ports[i], irq); } - return ata_host_register(host, sht); + rc = ata_host_register(host, sht); + if (rc) + goto free_irqs; + + return 0; + +free_irqs: + /* + * Free the IRQs which have been requested, so that the handlers can no + * longer access the MMIO of the host once we return, e.g. after the + * caller has disabled the clocks of the host. + */ + while (--i >= 0) { + struct ahci_port_priv *pp = host->ports[i]->private_data; + + if (!pp) + continue; + + devm_free_irq(host->dev, hpriv->get_irq_vector(host, i), + host->ports[i]); + } + + return rc; } /** -- 2.53.0