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If both ISDOTDOT and NOCROSSMOUNT are set then lookup() might breaks out

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of the special handling for ".." and perform an ISDOTDOT VOP_LOOKUP()
for a filesystem root vnode. Handle this case inside lookup().

Submitted by:	tegge
PR:		92785
MFC after:	1 week
This commit is contained in:
kib 2007-02-15 09:53:49 +00:00
parent 80c0e5fb98
commit b4f5200c2e
1 changed files with 4 additions and 3 deletions
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7
sys/kern/vfs_lookup.c
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@ -520,15 +520,16 @@ dirloop:
for (;;) {
if (dp == ndp->ni_rootdir ||
dp == ndp->ni_topdir ||
dp == rootvnode) {
dp == rootvnode ||
((dp->v_vflag & VV_ROOT) != 0 &&
(cnp->cn_flags & NOCROSSMOUNT) != 0)) {
ndp->ni_dvp = dp;
ndp->ni_vp = dp;
vfslocked = VFS_LOCK_GIANT(dp->v_mount);
VREF(dp);
goto nextname;
}
if ((dp->v_vflag & VV_ROOT) == 0 ||
(cnp->cn_flags & NOCROSSMOUNT))
if ((dp->v_vflag & VV_ROOT) == 0)
break;
if (dp->v_iflag & VI_DOOMED) { /* forced unmount */
error = EBADF;