From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Tue, 10 Dec 2013 10:35:47 +0000 (+0100)
Subject: m68k/mm: Check for mm != NULL in do_page_fault() debug code
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4e25c0e92f8eaf69bc51d1d523bcb7268e7dd162;p=linux-beck.git

m68k/mm: Check for mm != NULL in do_page_fault() debug code

When DEBUG is enabled, do_page_fault() may dereference a NULL pointer,
causing recursive bus errors.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---

diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
index eb1d61f68725..c7725f1de05d 100644
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -77,8 +77,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
 
 #ifdef DEBUG
 	printk ("do page fault:\nregs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld, %p\n",
-		regs->sr, regs->pc, address, error_code,
-		current->mm->pgd);
+		regs->sr, regs->pc, address, error_code, mm ? mm->pgd : NULL);
 #endif
 
 	/*