Author: kib
Date: Sun Dec  2 13:27:36 2018
New Revision: 341399
URL: https://svnweb.freebsd.org/changeset/base/341399

Log:
  Fix off by one in hpet_mmap() csw method.
  
  Reported by:  C Turt <[email protected]>
  Reviewed by:  alc, markj
  Tested by:    pho
  admbug:               781
  MFC after:    2 weeks
  Sponsored by: The FreeBSD Foundation

Modified:
  head/sys/dev/acpica/acpi_hpet.c

Modified: head/sys/dev/acpica/acpi_hpet.c
==============================================================================
--- head/sys/dev/acpica/acpi_hpet.c     Sun Dec  2 13:16:46 2018        
(r341398)
+++ head/sys/dev/acpica/acpi_hpet.c     Sun Dec  2 13:27:36 2018        
(r341399)
@@ -396,7 +396,7 @@ hpet_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_p
        struct hpet_softc *sc;
 
        sc = cdev->si_drv1;
-       if (offset > rman_get_size(sc->mem_res))
+       if (offset >= rman_get_size(sc->mem_res))
                return (EINVAL);
        if (!sc->mmap_allow_write && (nprot & PROT_WRITE))
                return (EPERM);
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