[PATCH v2 RESEND] m68k/kernel: array out of bound access in process_uboot_commandline

[Hangyu Hua]

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

Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
---
 arch/m68k/kernel/uboot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/m68k/kernel/uboot.c b/arch/m68k/kernel/uboot.c
index 928dbd33fc4a..63eaf3c3ddcd 100644
--- a/arch/m68k/kernel/uboot.c
+++ b/arch/m68k/kernel/uboot.c
@@ -101,5 +101,6 @@ __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;
 }
-- 
2.25.1