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 E0CEB3328E6; Fri, 17 Oct 2025 15:09:23 +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=1760713764; cv=none; b=GuqcgecRMvUU+q/38wnpejcsC9prC5PJ80bPmJNs+1KB4rP/zCepMgrm/zIPYp1jLDGzKq+kdGyUB/nPj0j8MiTPkoY0x4nDzlwQrvP/IKjRPoZflgE+vlZyhVY92Xx4d0EWvIfTcCSowFxj98tf0ewsNPESJyAH0mKkgu5pUGM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760713764; c=relaxed/simple; bh=oQ/ooIRWtzzKkZVuSxdFw03M7X9jNFsvK7AhSv4XWGM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=TYloA0D0sX2SoqCLVXCIqpIH9bLOADWc5VncJL1JN3skUjHMGIrGlJzL5e7K2vSmecT0v0FPVU84eH6JQDij0TTj2NTBFDqJWX0qY6eN5Imzw1UlbI+MnxT8/pK+BN5lJh5CiJeXZpoYQiEbofhnWLagcCfZVmqJwrWVfE73Xgw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UX5CLqXQ; 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="UX5CLqXQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7082FC4CEE7; Fri, 17 Oct 2025 15:09:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760713763; bh=oQ/ooIRWtzzKkZVuSxdFw03M7X9jNFsvK7AhSv4XWGM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UX5CLqXQpZVE5ZL7avoUi1adekMl9VLwJItDQlNj/2Z/mpdRGv2lMRsxLPXkcBv4W DoSn7YRcqhhJ+IoJIs93LTcLwx0/Xk1rvibUSVtFGK8CfV+9gEuQXt7+8zg7Wjy8ms gnNRwXpvdxarLI8DBxE4JFZX60uEWz1TjwnTxbO8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Nam Cao , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Madhavan Srinivasan Subject: [PATCH 6.6 110/201] powerpc/pseries/msi: Fix potential underflow and leak issue Date: Fri, 17 Oct 2025 16:52:51 +0200 Message-ID: <20251017145138.784357877@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251017145134.710337454@linuxfoundation.org> References: <20251017145134.710337454@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nam Cao commit 3443ff3be6e59b80d74036bb39f5b6409eb23cc9 upstream. pseries_irq_domain_alloc() allocates interrupts at parent's interrupt domain. If it fails in the progress, all allocated interrupts are freed. The number of successfully allocated interrupts so far is stored "i". However, "i - 1" interrupts are freed. This is broken: - One interrupt is not be freed - If "i" is zero, "i - 1" wraps around Correct the number of freed interrupts to 'i'. Fixes: a5f3d2c17b07 ("powerpc/pseries/pci: Add MSI domains") Signed-off-by: Nam Cao Cc: stable@vger.kernel.org Reviewed-by: Cédric Le Goater Signed-off-by: Madhavan Srinivasan Link: https://patch.msgid.link/a980067f2b256bf716b4cd713bc1095966eed8cd.1754300646.git.namcao@linutronix.de Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/platforms/pseries/msi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -587,7 +587,7 @@ static int pseries_irq_domain_alloc(stru out: /* TODO: handle RTAS cleanup in ->msi_finish() ? */ - irq_domain_free_irqs_parent(domain, virq, i - 1); + irq_domain_free_irqs_parent(domain, virq, i); return ret; }