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Apply the same fix to a potential race in the ISDOTDOT code

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in reiserfs_lookup() that was used to fix an actual race in
ufs_lookup.c:1.78. This is not currently a hazard, but the
bug would be activated by marking reiserfs as MPSAFE.

Reviewed by:	mux (mentor)
MFC after:	2 weeks
This commit is contained in:
Jean-Sébastien Pédron 2005-10-21 09:15:26 +00:00
parent 52ad48b69f
commit 9d575322b0
1 changed files with 3 additions and 1 deletions
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4
sys/gnu/fs/reiserfs/reiserfs_namei.c
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@ -30,6 +30,7 @@ reiserfs_lookup(struct vop_cachedlookup_args *ap)
int flags = cnp->cn_flags;
struct thread *td = cnp->cn_thread;
struct cpu_key *saved_ino;
struct vnode *vp;
struct vnode *pdp; /* Saved dp during symlink work */
@ -77,9 +78,10 @@ reiserfs_lookup(struct vop_cachedlookup_args *ap)
reiserfs_log(LOG_DEBUG, "reading vnode\n");
pdp = vdp;
if (flags & ISDOTDOT) {
saved_ino = (struct cpu_key *)&(de.de_dir_id);
VOP_UNLOCK(pdp, 0, td);
error = reiserfs_iget(vdp->v_mount,
(struct cpu_key *)&(de.de_dir_id), &vp, td);
saved_ino, &vp, td);
vn_lock(pdp, LK_EXCLUSIVE | LK_RETRY, td);
if (error != 0)
return (error);