Date: Thu, 5 Jan 2012 19:36:38 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r229628 - stable/8/sys/fs/devfs Message-ID: <201201051936.q05Jactn051736@svn.freebsd.org>
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Author: jhb Date: Thu Jan 5 19:36:38 2012 New Revision: 229628 URL: http://svn.freebsd.org/changeset/base/229628 Log: MFC 228361: Explicitly use curthread while manipulating td_fpop during last close of a devfs file descriptor in devfs_close_f(). The passed in td argument may be NULL if the close was invoked by garbage collection of open file descriptors in pending control messages in the socket buffer of a UNIX domain socket after it was closed. Modified: stable/8/sys/fs/devfs/devfs_vnops.c Directory Properties: stable/8/sys/ (props changed) stable/8/sys/amd64/include/xen/ (props changed) stable/8/sys/cddl/contrib/opensolaris/ (props changed) stable/8/sys/contrib/dev/acpica/ (props changed) stable/8/sys/contrib/pf/ (props changed) Modified: stable/8/sys/fs/devfs/devfs_vnops.c ============================================================================== --- stable/8/sys/fs/devfs/devfs_vnops.c Thu Jan 5 19:36:23 2012 (r229627) +++ stable/8/sys/fs/devfs/devfs_vnops.c Thu Jan 5 19:36:38 2012 (r229628) @@ -548,10 +548,14 @@ devfs_close_f(struct file *fp, struct th int error; struct file *fpop; - fpop = td->td_fpop; - td->td_fpop = fp; + /* + * NB: td may be NULL if this descriptor is closed due to + * garbage collection from a closed UNIX domain socket. + */ + fpop = curthread->td_fpop; + curthread->td_fpop = fp; error = vnops.fo_close(fp, td); - td->td_fpop = fpop; + curthread->td_fpop = fpop; /* * The f_cdevpriv cannot be assigned non-NULL value while we
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