linux-kernel - [PATCH] m68k/kernel: array out of bound access in process_uboot

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Message-Id: <20211227090917.35838-1-hbh25y@gmail.com>
Date:   Mon, 27 Dec 2021 17:09:17 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     geert@...ux-m68k.org
Cc:     linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
        Hangyu Hua <hbh25y@...il.com>
Subject: [PATCH] m68k/kernel: array out of bound access in process_uboot_commandline

When the size of commandp >= size, array out of bound write occurs because
len == 0.

Signed-off-by: Hangyu Hua <hbh25y@...il.com>
---
 arch/m68k/kernel/uboot.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/m68k/kernel/uboot.c b/arch/m68k/kernel/uboot.c
index 928dbd33fc4a..05eca6f653b5 100644
--- a/arch/m68k/kernel/uboot.c
+++ b/arch/m68k/kernel/uboot.c
@@ -101,5 +101,8 @@ __init void process_uboot_commandline(char *commandp, int size)
 	}
 
 	parse_uboot_commandline(commandp, len);
-	commandp[len - 1] = 0;
+	if (len > 0)
+		commandp[len - 1] = 0;
+	else
+		commandp[0] = 0;
 }
-- 
2.25.1