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check if curproc is invalid, and do panic. 

otherwise, we can't useful backtrace.
Ex. address error in interrupt handler.
This commit is contained in:
shin 2001-12-28 02:13:14 +00:00
parent da0ba70058
commit f15b256063
1 changed files with 4 additions and 4 deletions
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8
sys/arch/mips/mips/trap.c
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@ -1,4 +1,4 @@
/* $NetBSD: trap.c,v 1.165 2001/11/14 18:15:26 thorpej Exp $ */
/* $NetBSD: trap.c,v 1.166 2001/12/28 02:13:14 shin Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -44,7 +44,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.165 2001/11/14 18:15:26 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.166 2001/12/28 02:13:14 shin Exp $");
#include "opt_cputype.h" /* which mips CPU levels do we support? */
#include "opt_ktrace.h"
@ -318,7 +318,7 @@ trap(status, cause, vaddr, opc, frame)
* It is an error for the kernel to access user space except
* through the copyin/copyout routines.
*/
if (p->p_addr->u_pcb.pcb_onfault == NULL)
if (p == NULL || p->p_addr->u_pcb.pcb_onfault == NULL)
goto dopanic;
/* check for fuswintr() or suswintr() getting a page fault */
if (p->p_addr->u_pcb.pcb_onfault == (caddr_t)fswintrberr) {
@ -410,7 +410,7 @@ trap(status, cause, vaddr, opc, frame)
case T_ADDR_ERR_ST: /* misaligned access */
case T_BUS_ERR_LD_ST: /* BERR asserted to cpu */
copyfault:
if (p->p_addr->u_pcb.pcb_onfault == NULL)
if (p == NULL || p->p_addr->u_pcb.pcb_onfault == NULL)
goto dopanic;
frame->tf_epc = (int)p->p_addr->u_pcb.pcb_onfault;
return; /* KERN */