• Aaron Campbell's avatar
    iommu/vt-d: Fix infinite loop in free_all_cpu_cached_iovas · 0caa7616
    Aaron Campbell authored
    Per VT-d spec Section 10.4.2 ("Capability Register"), the maximum
    number of possible domains is 64K; indeed this is the maximum value
    that the cap_ndoms() macro will expand to.  Since the value 65536
    will not fix in a u16, the 'did' variable must be promoted to an
    int, otherwise the test for < 65536 will always be true and the
    loop will never end.
    
    The symptom, in my case, was a hung machine during suspend.
    
    Fixes: 3bd4f911 ("iommu/vt-d: Fix overflow of iommu->domains array")
    Signed-off-by: default avatarAaron Campbell <aaron@monkey.org>
    Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
    0caa7616
intel-iommu.c 134 KB