Date: Wed, 27 May 2015 09:09:13 -0400 From: Benjamin Kaduk <bjkfbsd@gmail.com> To: Konstantin Belousov <kib@freebsd.org> Cc: "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org> Subject: Re: svn commit: r283602 - in head/sys: cddl/contrib/opensolaris/uts/common/fs/zfs kern Message-ID: <CAJ5_RoAszUy6PXZ504CAW6m%2Bf23UaWM57Qb4QzLp6E9UTSvU5A@mail.gmail.com> In-Reply-To: <201505270922.t4R9MoZv065205@svn.freebsd.org> References: <201505270922.t4R9MoZv065205@svn.freebsd.org>
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On Wed, May 27, 2015 at 5:22 AM, Konstantin Belousov <kib@freebsd.org> wrote: > Author: kib > Date: Wed May 27 09:22:50 2015 > New Revision: 283602 > URL: https://svnweb.freebsd.org/changeset/base/283602 > > Log: > Right now, dounmount() is called with unreferenced mount point. > Nothing stops a parallel unmount to suceed before the given call to > dounmount() checks and locks the covered vnode. Prevent dounmount() > from acting on the freed (although type-stable) memory by changing the > interface to require the mount point to be referenced. dounmount() > consumes the reference on return, regardless of the sucessfull or > erronous result. > Should __FreeBSD_version get bumped? -Ben
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