[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] xen: Fix xenctl_cpumap_to_cpumask buffer size check
xenctl_cpumap_to_cpumask incorrectly uses sizeof when checking whether bits should be masked off from the input cpumap bitmap or not. Fix by using the correct cpumask buffer size in place of sizeof. Signed-off-by: Matthew Daley <mattjd@xxxxxxxxx> diff --git a/xen/common/domctl.c b/xen/common/domctl.c index e153cb4..204e951 100644 --- a/xen/common/domctl.c +++ b/xen/common/domctl.c @@ -78,7 +78,7 @@ int xenctl_cpumap_to_cpumask( { if ( copy_from_guest(bytemap, xenctl_cpumap->bitmap, copy_bytes) ) err = -EFAULT; - if ( (xenctl_cpumap->nr_cpus & 7) && (guest_bytes <= sizeof(bytemap)) ) + if ( (xenctl_cpumap->nr_cpus & 7) && (guest_bytes <= (nr_cpu_ids + 7) / 8) ) bytemap[guest_bytes-1] &= ~(0xff << (xenctl_cpumap->nr_cpus & 7)); } -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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