Messages in this thread Patch in this message | | | 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 |
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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> --- 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
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