Date: Thu, 8 Oct 2009 11:42:24 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org Subject: svn commit: r197857 - in stable/7/sys: . contrib/pf kern Message-ID: <200910081142.n98BgOGp021906@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: kib Date: Thu Oct 8 11:42:24 2009 New Revision: 197857 URL: http://svn.freebsd.org/changeset/base/197857 Log: MFC r197662: Do not dereference vp->v_mount without holding vnode lock and checking that the vnode is not reclaimed. Modified: stable/7/sys/ (props changed) stable/7/sys/contrib/pf/ (props changed) stable/7/sys/kern/uipc_syscalls.c Modified: stable/7/sys/kern/uipc_syscalls.c ============================================================================== --- stable/7/sys/kern/uipc_syscalls.c Thu Oct 8 11:36:06 2009 (r197856) +++ stable/7/sys/kern/uipc_syscalls.c Thu Oct 8 11:42:24 2009 (r197857) @@ -2076,9 +2076,11 @@ retry_space: /* * Get the page from backing store. */ - bsize = vp->v_mount->mnt_stat.f_iosize; vfslocked = VFS_LOCK_GIANT(vp->v_mount); - vn_lock(vp, LK_SHARED | LK_RETRY, td); + error = vn_lock(vp, LK_SHARED, td); + if (error != 0) + goto after_read; + bsize = vp->v_mount->mnt_stat.f_iosize; /* * XXXMAC: Because we don't have fp->f_cred @@ -2091,6 +2093,7 @@ retry_space: IO_VMIO | ((MAXBSIZE / bsize) << IO_SEQSHIFT), td->td_ucred, NOCRED, &resid, td); VOP_UNLOCK(vp, 0, td); + after_read: VFS_UNLOCK_GIANT(vfslocked); VM_OBJECT_LOCK(obj); vm_page_io_finish(pg);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200910081142.n98BgOGp021906>