linux-kernel - [PATCH AUTOSEL 5.15 20/24] mips: Move initrd_start check after initrd address sanitisation.

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Message-Id: <20230531134320.3384102-20-sashal@kernel.org>
Date:   Wed, 31 May 2023 09:43:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Liviu Dudau <liviu@...au.co.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Sasha Levin <sashal@...nel.org>, Jason@...c4.com,
        nathan@...nel.org, yury.norov@...il.com, linux-mips@...r.kernel.org
Subject: [PATCH AUTOSEL 5.15 20/24] mips: Move initrd_start check after initrd address sanitisation.

From: Liviu Dudau <liviu@...au.co.uk>

[ Upstream commit 4897a898a216058dec55e5e5902534e6e224fcdf ]

PAGE_OFFSET is technically a virtual address so when checking the value of
initrd_start against it we should make sure that it has been sanitised from
the values passed by the bootloader. Without this change, even with a bootloader
that passes correct addresses for an initrd, we are failing to load it on MT7621
boards, for example.

Signed-off-by: Liviu Dudau <liviu@...au.co.uk>
Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/kernel/setup.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index ef73ba1e0ec10..c8d849d8a8440 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -156,10 +156,6 @@ static unsigned long __init init_initrd(void)
 		pr_err("initrd start must be page aligned\n");
 		goto disable;
 	}
-	if (initrd_start < PAGE_OFFSET) {
-		pr_err("initrd start < PAGE_OFFSET\n");
-		goto disable;
-	}
 
 	/*
 	 * Sanitize initrd addresses. For example firmware
@@ -172,6 +168,11 @@ static unsigned long __init init_initrd(void)
 	initrd_end = (unsigned long)__va(end);
 	initrd_start = (unsigned long)__va(__pa(initrd_start));
 
+	if (initrd_start < PAGE_OFFSET) {
+		pr_err("initrd start < PAGE_OFFSET\n");
+		goto disable;
+	}
+
 	ROOT_DEV = Root_RAM0;
 	return PFN_UP(end);
 disable:
-- 
2.39.2