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diff --git a/sys/fs/nfsserver/nfs_nfsdport.c.sav b/sys/fs/nfsserver/nfs_nfsdport.c
--- a/sys/fs/nfsserver/nfs_nfsdport.c.sav
+++ b/sys/fs/nfsserver/nfs_nfsdport.c
@@ -6581,6 +6581,12 @@
mb->m_next = NULL;
}
if ((mb->m_flags & M_EXTPG) != 0) {
+ KASSERT(bextpg >= 0 && bextpg < mb->m_epg_npgs,
+ ("nfsm_trimtrailing: bextpg out of range"));
+ KASSERT(bpos == (char *)(void *)
+ PHYS_TO_DMAP(mb->m_epg_pa[bextpg]) + PAGE_SIZE - bextpgsiz,
+ ("nfsm_trimtrailing: bextpgsiz bad!"));
+
/* First, get rid of any pages after this position. */
for (i = mb->m_epg_npgs - 1; i > bextpg; i--) {
pg = PHYS_TO_VM_PAGE(mb->m_epg_pa[i]);

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