From e909be825212da62433e805f03586015a04f3c78 Mon Sep 17 00:00:00 2001 From: Vincent Wen Date: Thu, 19 Jul 2012 09:11:16 +0200 Subject: [PATCH] MIPS: Fix Magic SysRq L kernel crash. show_backtrace() was passed a NULL pointer which caused paging request fail. Set to current task as other architectures (ARM, etc) do when passed a NULL task pointer. Signed-off-by: Vincent Wen Cc: linux-mips@linux-mips.org Cc: cernekee@gmail.com Patchwork: https://patchwork.linux-mips.org/patch/3524/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/traps.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index ce95f2c41f3f..9716f057a77b 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -132,6 +132,9 @@ static void show_backtrace(struct task_struct *task, const struct pt_regs *regs) unsigned long ra = regs->regs[31]; unsigned long pc = regs->cp0_epc; + if (!task) + task = current; + if (raw_show_trace || !__kernel_text_address(pc)) { show_raw_backtrace(sp); return; -- 2.20.1