Date: Tue, 28 Mar 2017 05:57:20 +0000 (UTC) From: Ngie Cooper <ngie@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r316070 - stable/10/lib/libkvm Message-ID: <201703280557.v2S5vKjc002719@repo.freebsd.org>
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Author: ngie Date: Tue Mar 28 05:57:20 2017 New Revision: 316070 URL: https://svnweb.freebsd.org/changeset/base/316070 Log: MFC r315647: Handle kd == NULL gracefully with kvm_close(3) Don't segfault in kvm_close(3) if provided a NULL pointer. Instead, return -1 and set errno to EINVAL. Document this new behavior explicitly. Modified: stable/10/lib/libkvm/kvm.c stable/10/lib/libkvm/kvm_open.3 Directory Properties: stable/10/ (props changed) Modified: stable/10/lib/libkvm/kvm.c ============================================================================== --- stable/10/lib/libkvm/kvm.c Tue Mar 28 04:48:55 2017 (r316069) +++ stable/10/lib/libkvm/kvm.c Tue Mar 28 05:57:20 2017 (r316070) @@ -262,6 +262,10 @@ kvm_close(kvm_t *kd) { int error = 0; + if (kd == NULL) { + errno = EINVAL; + return (-1); + } if (kd->pmfd >= 0) error |= close(kd->pmfd); if (kd->vmfd >= 0) Modified: stable/10/lib/libkvm/kvm_open.3 ============================================================================== --- stable/10/lib/libkvm/kvm_open.3 Tue Mar 28 04:48:55 2017 (r316069) +++ stable/10/lib/libkvm/kvm_open.3 Tue Mar 28 05:57:20 2017 (r316070) @@ -32,7 +32,7 @@ .\" @(#)kvm_open.3 8.3 (Berkeley) 4/19/94 .\" $FreeBSD$ .\" -.Dd January 29, 2004 +.Dd March 20, 2017 .Dt KVM_OPEN 3 .Os .Sh NAME @@ -181,10 +181,29 @@ is returned, in which case writes the error message into .Fa errbuf . .Pp +.Rv -std kvm_close +.Sh ERRORS The .Fn kvm_close -function returns 0 on success and -1 on failure. +function may fail and set the global variable +.Va errno +for any of the errors specified for +.Xr close 2 . +.Pp +The +.Fn kvm_close +function may also fail and set +.Va errno +if: +.Bl -tag -width Er +.It Bq Er EINVAL +The value passed via +.Fa kd +was +.Dv NULL . +.El .Sh SEE ALSO +.Xr close 2 , .Xr open 2 , .Xr kvm 3 , .Xr kvm_getargv 3 ,
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