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ifnet: Assert that we are assigning network stack correctly

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It makes no sense to assign NULL vnet to an interface when the kernel
option VIMAGE is enabled. Add an assertion to catch that.

This will also help diagnosing problem report [1] and [2].

1. https://bugs.freebsd.org/275381
2. https://bugs.freebsd.org/282168

Reviewed by:	kp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D46982

(cherry picked from commit d1d839d0b593541174ca48c675c9eff4ddb4715e)
This commit is contained in:
Zhenlei Huang 2024-10-22 12:32:24 +08:00
parent 01f4a503eb
commit 2f3c87296c
1 changed files with 1 additions and 0 deletions
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sys/net/if.c
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@ -834,6 +834,7 @@ if_attach_internal(struct ifnet *ifp, bool vmove)
MPASS(ifindex_table[ifp->if_index].ife_ifnet == ifp);
#ifdef VIMAGE
CURVNET_ASSERT_SET();
ifp->if_vnet = curvnet;
if (ifp->if_home_vnet == NULL)
ifp->if_home_vnet = curvnet;