Date: Sat, 28 Jan 2012 01:38:48 +0000 (UTC) From: Ed Maste <emaste@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r230636 - head/sys/dev/hwpmc Message-ID: <201201280138.q0S1cmgS069760@svn.freebsd.org>
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Author: emaste Date: Sat Jan 28 01:38:48 2012 New Revision: 230636 URL: http://svn.freebsd.org/changeset/base/230636 Log: pmc_*_initialize may return NULL if the CPU is not supported, so check that md is not null before dereferencing it. PR: kern/156540 Modified: head/sys/dev/hwpmc/hwpmc_x86.c Modified: head/sys/dev/hwpmc/hwpmc_x86.c ============================================================================== --- head/sys/dev/hwpmc/hwpmc_x86.c Sat Jan 28 00:17:17 2012 (r230635) +++ head/sys/dev/hwpmc/hwpmc_x86.c Sat Jan 28 01:38:48 2012 (r230636) @@ -250,7 +250,7 @@ pmc_md_initialize() return (NULL); /* disallow sampling if we do not have an LAPIC */ - if (!lapic_enable_pmc()) + if (md != NULL && !lapic_enable_pmc()) for (i = 1; i < md->pmd_nclass; i++) md->pmd_classdep[i].pcd_caps &= ~PMC_CAP_INTERRUPT;
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