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uvm_mremap: reference the appropriate backing object.

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The previous approach was appropriate for anonymous
memory and device objects, which continue to work in
the same way.

OK: chs@
Fixes: PR 55237
This commit is contained in:
yhardy 2020-11-27 22:32:43 +00:00
parent 69109c6c58
commit e11fdcfcc6
1 changed files with 4 additions and 6 deletions
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10
sys/uvm/uvm_mremap.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_mremap.c,v 1.20 2020/02/23 15:46:43 ad Exp $ */
/* $NetBSD: uvm_mremap.c,v 1.21 2020/11/27 22:32:43 yhardy Exp $ */
/*-
* Copyright (c)2006,2007,2009 YAMAMOTO Takashi,
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_mremap.c,v 1.20 2020/02/23 15:46:43 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_mremap.c,v 1.21 2020/11/27 22:32:43 yhardy Exp $");
#include <sys/param.h>
#include <sys/mman.h>
@ -80,10 +80,8 @@ uvm_mapent_extend(struct vm_map *map, vaddr_t endva, vsize_t size)
error = E2BIG; /* XXX */
goto done;
}
rw_enter(uobj->vmobjlock, RW_WRITER);
KASSERT(uobj->uo_refs > 0);
atomic_inc_uint(&uobj->uo_refs);
rw_exit(uobj->vmobjlock);
if (uobj->pgops->pgo_reference)
uobj->pgops->pgo_reference(uobj);
reserved_entry->object.uvm_obj = uobj;
reserved_entry->offset = newoffset;
}