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fix infinite recursion through thr_getspecific

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This commit is contained in:
christos 2016-02-28 02:56:39 +00:00
parent 0048ede9cd
commit 52ae8af955
1 changed files with 7 additions and 2 deletions
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9
common/lib/libc/gmon/mcount.c
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@ -1,4 +1,4 @@
/* $NetBSD: mcount.c,v 1.12 2016/01/11 01:57:12 christos Exp $ */
/* $NetBSD: mcount.c,v 1.13 2016/02/28 02:56:39 christos Exp $ */
/*
* Copyright (c) 2003, 2004 Wasabi Systems, Inc.
@ -76,7 +76,7 @@
#if 0
static char sccsid[] = "@(#)mcount.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: mcount.c,v 1.12 2016/01/11 01:57:12 christos Exp $");
__RCSID("$NetBSD: mcount.c,v 1.13 2016/02/28 02:56:39 christos Exp $");
#endif
#endif
@ -145,12 +145,17 @@ _MCOUNT_DECL(u_long frompc, u_long selfpc)
#if defined(_REENTRANT) && !defined(_KERNEL)
if (__isthreaded) {
/* prevent re-entry via thr_getspecific */
if (_gmonparam.state != GMON_PROF_ON)
return;
_gmonparam.state = GMON_PROF_BUSY;
p = thr_getspecific(_gmonkey);
if (p == NULL) {
/* Prevent recursive calls while allocating */
thr_setspecific(_gmonkey, &_gmondummy);
p = _m_gmon_alloc();
}
_gmonparam.state = GMON_PROF_ON;
} else
#endif
p = &_gmonparam;