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| author |   Dan Carpenter <dan.carpenter@oracle.com> | 2019-03-07 08:41:22 +0300 |
|---|---|---|
| committer |   Juergen Gross <jgross@suse.com> | 2019-03-08 17:58:14 +0100 |
| commit | 201676095dda7e5b31a5e1d116d10fc22985075e (patch) | |
| tree | 813e414ea824d48f18cf89c805fba00dd7831fb8 /drivers/xen | |
| parent | xen: remove pre-xen3 fallback handlers (diff) | |
| download | linux-dev-201676095dda7e5b31a5e1d116d10fc22985075e.tar.xz linux-dev-201676095dda7e5b31a5e1d116d10fc22985075e.zip | |
xen, cpu_hotplug: Prevent an out of bounds access
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: d68d82afd4c8 ("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>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/cpu_hotplug.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c index b1357aa4bc55..f192b6f42da9 100644 --- a/drivers/xen/cpu_hotplug.c +++ b/drivers/xen/cpu_hotplug.c @@ -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)) { |