linux-kernel - [PATCH 4/4] alpha: Use absolute_pointer for strcmp on fixed memory location

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Message-Id: <20210912160149.2227137-5-linux@roeck-us.net>
Date:   Sun, 12 Sep 2021 09:01:49 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-alpha@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-kernel@...r.kernel.org, linux-parisc@...r.kernel.org,
        netdev@...r.kernel.org, linux-sparse@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 4/4] alpha: Use absolute_pointer for strcmp on fixed memory location

alpha:allmodconfig fails to build with the following error
when using gcc 11.x.

arch/alpha/kernel/setup.c: In function 'setup_arch':
arch/alpha/kernel/setup.c:493:13: error:
	'strcmp' reading 1 or more bytes from a region of size 0

Avoid the problem by using absolute_pointer() when providing a memory
address to strcmp().

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 arch/alpha/kernel/setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index b4fbbba30aa2..aab477a76c30 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -490,7 +490,7 @@ setup_arch(char **cmdline_p)
 	/* Hack for Jensen... since we're restricted to 8 or 16 chars for
 	   boot flags depending on the boot mode, we need some shorthand.
 	   This should do for installation.  */
-	if (strcmp(COMMAND_LINE, "INSTALL") == 0) {
+	if (strcmp(absolute_pointer(COMMAND_LINE), "INSTALL") == 0) {
 		strlcpy(command_line, "root=/dev/fd0 load_ramdisk=1", sizeof command_line);
 	} else {
 		strlcpy(command_line, COMMAND_LINE, sizeof command_line);
-- 
2.33.0