diff options
| author | peter <peter@FreeBSD.org> | 1999-06-05 05:26:36 +0000 |
|---|---|---|
| committer | peter <peter@FreeBSD.org> | 1999-06-05 05:26:36 +0000 |
| commit | 06a6a667a6bf7a90688c9b4f6a3bac0a4f01a1c6 (patch) | |
| tree | 8ba2f46dfc52862d028e863eeae51775f5a5452b /sys/nfs | |
| parent | 486459045470f6c024b357b301ce2f043f1b4eab (diff) | |
| download | FreeBSD-src-06a6a667a6bf7a90688c9b4f6a3bac0a4f01a1c6.zip FreeBSD-src-06a6a667a6bf7a90688c9b4f6a3bac0a4f01a1c6.tar.gz | |
Fix a malloc race
Obtained from: OpenBSD (csapuntz)
Diffstat (limited to 'sys/nfs')
| -rw-r--r-- | sys/nfs/nfs_node.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/sys/nfs/nfs_node.c b/sys/nfs/nfs_node.c index 4c01d6f..c3958c0 100644 --- a/sys/nfs/nfs_node.c +++ b/sys/nfs/nfs_node.c @@ -34,7 +34,7 @@ * SUCH DAMAGE. * * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95 - * $Id: nfs_node.c,v 1.27 1998/05/24 14:41:49 peter Exp $ + * $Id: nfs_node.c,v 1.28 1998/09/29 23:15:25 mckusick Exp $ */ @@ -107,12 +107,13 @@ nfs_nget(mntp, fhp, fhsize, npp) struct nfsnode **npp; { struct proc *p = curproc; /* XXX */ - struct nfsnode *np; + struct nfsnode *np, *np2; struct nfsnodehashhead *nhpp; register struct vnode *vp; struct vnode *nvp; int error; +retry: nhpp = NFSNOHASH(nfs_hash(fhp, fhsize)); loop: for (np = nhpp->lh_first; np != 0; np = np->n_hash.le_next) { @@ -161,6 +162,13 @@ loop: /* * Insert the nfsnode in the hash queue for its new file handle */ + for (np2 = nhpp->lh_first; np2 != 0; np2 = np2->n_hash.le_next) { + if (mntp != NFSTOV(np)->v_mount || np2->n_fhsize != fhsize || + bcmp((caddr_t)fhp, (caddr_t)np2->n_fhp, fhsize)) + continue; + vrele(vp); + goto retry; + } LIST_INSERT_HEAD(nhpp, np, n_hash); if (fhsize > NFS_SMALLFH) { MALLOC(np->n_fhp, nfsfh_t *, fhsize, M_NFSBIGFH, M_WAITOK); @@ -248,7 +256,8 @@ nfs_reclaim(ap) if (prtactive && vp->v_usecount != 0) vprint("nfs_reclaim: pushing active", vp); - LIST_REMOVE(np, n_hash); + if (np->n_hash.le_prev != NULL) + LIST_REMOVE(np, n_hash); /* * For nqnfs, take it off the timer queue as required. |
