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xen, cpu_hotplug: Prevent an out of bounds access

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[ Upstream commit 201676095dda7e5b31a5e1d116d10fc22985075e ]

The "cpu" variable comes from the sscanf() so Smatch marks it as
untrusted data.  We can't pass a higher value than "nr_cpu_ids" to
cpu_possible() or it results in an out of bounds access.

Fixes: d68d82afd4 ("xen: implement CPU hotplugging")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2019-03-07 08:41:22 +03:00 committed by Greg Kroah-Hartman
parent 5f4144822d
commit a663874605
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/cpu_hotplug.c
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@ -54,7 +54,7 @@ static int vcpu_online(unsigned int cpu)
}
static void vcpu_hotplug(unsigned int cpu)
{
if (!cpu_possible(cpu))
if (cpu >= nr_cpu_ids || !cpu_possible(cpu))
return;
switch (vcpu_online(cpu)) {