From mboxrd@z Thu Jan 1 00:00:00 1970 From: Geert Uytterhoeven Subject: [PATCH 1/3] m68k/mm: Check for mm != NULL in do_page_fault() debug code Date: Tue, 10 Dec 2013 12:11:58 +0100 Message-ID: <1386673920-5670-1-git-send-email-geert@linux-m68k.org> Return-path: Sender: linux-m68k-owner@vger.kernel.org List-Id: linux-m68k@vger.kernel.org To: linux-m68k@lists.linux-m68k.org Cc: Joe Perches , linux-kernel@vger.kernel.org, Geert Uytterhoeven When DEBUG is enabled, do_page_fault() may dereference a NULL pointer, causing recursive bus errors. Signed-off-by: Geert Uytterhoeven --- arch/m68k/mm/fault.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) 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 /* -- 1.7.9.5