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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-03-07 08:41:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-29 10:24:18 +0100 |
| commit | 93501e7330aacb38e15d26aaddc1df3485acff91 (patch) | |
| tree | c850467a40a6ba356e8b6193e3ae89f06c88cbd2 /drivers/xen | |
| parent | 743f4da870bf40b11101be0177ed8ea9e86fceeb (diff) | |
xen, cpu_hotplug: Prevent an out of bounds access
[ 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: 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: Sasha Levin <sashal@kernel.org>
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 f4e59c445964..17054d695411 100644 --- a/drivers/xen/cpu_hotplug.c +++ b/drivers/xen/cpu_hotplug.c @@ -53,7 +53,7 @@ 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)) { |