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);
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