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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-03-07 08:41:22 +0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2019-07-09 22:04:14 +0100 |
| commit | c6811c231798d516cab653b34a1d44d7491edf27 (patch) | |
| tree | ec0eb58c97098ab02d26f6b21b154cf6e564063c | |
| parent | c70d1929aa130f2a9fa00dd2ca6ac532bcb599e9 (diff) | |
| download | linux-stable-c6811c231798d516cab653b34a1d44d7491edf27.tar.gz linux-stable-c6811c231798d516cab653b34a1d44d7491edf27.tar.bz2 linux-stable-c6811c231798d516cab653b34a1d44d7491edf27.zip | |
xen, cpu_hotplug: Prevent an out of bounds access
commit 201676095dda7e5b31a5e1d116d10fc22985075e upstream.
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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -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 cc6513a176b0..3a69af6f0718 100644 --- a/drivers/xen/cpu_hotplug.c +++ b/drivers/xen/cpu_hotplug.c @@ -47,7 +47,7 @@ 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)) { |