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Message-ID: <8e9936e5-d720-4ded-8961-b9475aeb2ac7@web.de>
Date: Thu, 21 Aug 2025 18:28:14 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: stable@...r.kernel.org, tudor.ambarus@...aro.org,
 LKML <linux-kernel@...r.kernel.org>, kernel-janitors@...r.kernel.org,
 Christian König <christian.koenig@....com>,
 D Scott Phillips <scott@...amperecomputing.com>,
 Krzysztof Wilczyński <kw@...ux.com>, Rio Liu <rio@....me>
Subject: Re: [PATCH v2 1/3] PCI: Relaxed tail alignment should never increase
 min_align

…
> Ensure min_align is not increased by the relaxed tail alignment.
…


…
+++ b/drivers/pci/setup-bus.c
…
@@ -1261,8 +1263,9 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 		if (bus->self && size1 &&
 		    !pbus_upstream_space_available(bus, mask | IORESOURCE_PREFETCH, type,
 						   size1, add_align)) {
-			min_align = 1ULL << (max_order + __ffs(SZ_1M));
-			min_align = max(min_align, win_align);
+			relaxed_align = 1ULL << (max_order + __ffs(SZ_1M));
+			relaxed_align = max(min_align, win_align);
…

I wonder why a variable content would be overwritten here
without using the previous value.
https://cwe.mitre.org/data/definitions/563.html

Regards,
Markus

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