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Fix a null pointer dereference during rename(2).

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This commit is contained in:
mycroft 1994-07-20 07:37:25 +00:00
parent dd628fd6d9
commit 6436952bbc
1 changed files with 5 additions and 4 deletions
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9
sys/miscfs/nullfs/null_vnops.c
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@ -1,4 +1,4 @@
/* $NetBSD: null_vnops.c,v 1.2 1994/06/29 06:34:35 cgd Exp $ */
/* $NetBSD: null_vnops.c,v 1.3 1994/07/20 07:37:25 mycroft Exp $ */
/*
* Copyright (c) 1992, 1993
@ -250,8 +250,9 @@ null_bypass(ap)
* are of our type. Check for and don't map any
* that aren't. (We must always map first vp or vclean fails.)
*/
if (i && (*this_vp_p)->v_op != null_vnodeop_p) {
old_vps[i] = NULL;
if (i && (*this_vp_p == NULLVP ||
(*this_vp_p)->v_op != null_vnodeop_p)) {
old_vps[i] = NULLVP;
} else {
old_vps[i] = *this_vp_p;
*(vps_p[i]) = NULLVPTOLOWERVP(*this_vp_p);
@ -281,7 +282,7 @@ null_bypass(ap)
for (i = 0; i < VDESC_MAX_VPS; reles >>= 1, i++) {
if (descp->vdesc_vp_offsets[i] == VDESC_NO_OFFSET)
break; /* bail out at end of list */
if (old_vps[i]) {
if (old_vps[i] != NULLVP) {
*(vps_p[i]) = old_vps[i];
if (reles & 1)
vrele(*(vps_p[i]));