[PATCH] MIPS: Fixed __debug_virt_addr_valid()

From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-mips@vger.kernel.org
Cc: gerg@kernel.org, fancer.lancer@gmail.com,
	Florian Fainelli <f.fainelli@gmail.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH] MIPS: Fixed __debug_virt_addr_valid()
Date: Thu,  7 Jul 2022 14:52:36 -0700	[thread overview]
Message-ID: <20220707215237.1730283-1-f.fainelli@gmail.com> (raw)

It is permissible for kernel code to call virt_to_phys() against virtual
addresses that are in KSEG0 or KSEG1 and we need to be dealing with both
types. Add a final condition that ensures that the virtual address is
below KSEG2.

Fixes: dfad83cb7193 ("MIPS: Add support for CONFIG_DEBUG_VIRTUAL")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 arch/mips/mm/physaddr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/mips/mm/physaddr.c b/arch/mips/mm/physaddr.c
index a1ced5e44951..a82f8f57a652 100644
--- a/arch/mips/mm/physaddr.c
+++ b/arch/mips/mm/physaddr.c
@@ -5,6 +5,7 @@
 #include <linux/mmdebug.h>
 #include <linux/mm.h>
 
+#include <asm/addrspace.h>
 #include <asm/sections.h>
 #include <asm/io.h>
 #include <asm/page.h>
@@ -30,7 +31,7 @@ static inline bool __debug_virt_addr_valid(unsigned long x)
 	if (x == MAX_DMA_ADDRESS)
 		return true;
 
-	return false;
+	return KSEGX(x) < KSEG2;
 }
 
 phys_addr_t __virt_to_phys(volatile const void *x)
-- 
2.25.1

