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D47992.id148171.diff
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diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c
--- a/sys/kern/kern_jail.c
+++ b/sys/kern/kern_jail.c
@@ -1688,8 +1688,8 @@
#ifdef VIMAGE
/* Allocate a new vnet if specified. */
- pr->pr_vnet = (pr_flags & PR_VNET)
- ? vnet_alloc() : ppr->pr_vnet;
+ pr->pr_vnet = (pr_flags & PR_VNET) ?
+ vnet_alloc() : ppr->pr_vnet;
#endif
/*
* Allocate a dedicated cpuset for each jail.
@@ -3207,9 +3207,12 @@
* Removing a prison frees references
* from its parent.
*/
+ ppr = pr->pr_parent;
+ pr->pr_parent = NULL;
mtx_unlock(&pr->pr_mtx);
+
+ pr = ppr;
flags &= ~PD_LOCKED;
- pr = pr->pr_parent;
flags |= PD_DEREF | PD_DEUREF;
continue;
}
@@ -3236,7 +3239,7 @@
*/
TAILQ_FOREACH_SAFE(rpr, &freeprison, pr_list, tpr) {
#ifdef VIMAGE
- if (rpr->pr_vnet != rpr->pr_parent->pr_vnet)
+ if (rpr->pr_flags & PR_VNET)
vnet_destroy(rpr->pr_vnet);
#endif
if (rpr->pr_root != NULL)
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D47992.id148171.diff (976 B)
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D47992: jail: Avoid a use-after-free when destroying jails
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