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sys__lwp_suspend: Handle the possible problem when target LWP might exit via

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lwp_exit() before suspending.  In such case, LWP might be already freed after
cv_wait_sig() and checking the list of LWPs via lwp_find() is necessary.

Possible problem catched by Andrew Doran.
This commit is contained in:
rmind 2007-08-15 02:50:40 +00:00
parent 89d3c65ccd
commit d2142b3188
1 changed files with 6 additions and 2 deletions
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8
sys/kern/sys_lwp.c
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@ -1,4 +1,4 @@
/* $NetBSD: sys_lwp.c,v 1.24 2007/08/07 19:00:42 ad Exp $ */
/* $NetBSD: sys_lwp.c,v 1.25 2007/08/15 02:50:40 rmind Exp $ */
/*-
* Copyright (c) 2001, 2006, 2007 The NetBSD Foundation, Inc.
@ -42,7 +42,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_lwp.c,v 1.24 2007/08/07 19:00:42 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: sys_lwp.c,v 1.25 2007/08/15 02:50:40 rmind Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -239,6 +239,10 @@ sys__lwp_suspend(struct lwp *l, void *v, register_t *retval)
error = ERESTART;
break;
}
if (lwp_find(p, SCARG(uap, target)) == NULL) {
error = ESRCH;
break;
}
if ((l->l_flag | t->l_flag) & (LW_WCORE | LW_WEXIT)) {
error = ERESTART;
break;