diff options
| author | Mathias Krause <minipli@googlemail.com> | 2013-02-19 20:47:07 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-04 06:03:33 +0800 |
| commit | 5301bad549d69f19ba2d89c38239c92435ae3b89 (patch) | |
| tree | 4a1b90ab6633dd963f4e120b2aeb505d767e97fc /arch | |
| parent | e839e49caff7f31a165e9115c5a84a9236e958ab (diff) | |
x86/apic: Fix parsing of the 'lapic' cmdline option
commit 27cf929845b10043f2257693c7d179a9e0b1980e upstream.
Including " lapic " in the kernel cmdline on an x86-64 kernel
makes it panic while parsing early params -- e.g. with no user
visible output.
Fix this bug by ensuring arg is non-NULL before passing it to
strncmp().
Reported-by: PaX Team <pageexec@freemail.hu>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1361303227-13174-1-git-send-email-minipli@googlemail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index b994cc84aa7e..cbf5121fdd2b 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -131,7 +131,7 @@ static int __init parse_lapic(char *arg) { if (config_enabled(CONFIG_X86_32) && !arg) force_enable_local_apic = 1; - else if (!strncmp(arg, "notscdeadline", 13)) + else if (arg && !strncmp(arg, "notscdeadline", 13)) setup_clear_cpu_cap(X86_FEATURE_TSC_DEADLINE_TIMER); return 0; } |