[GIT PULL] smp/urgent fixes

[Ingo Molnar]

Linus,

Please pull the latest smp-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
smp-urgent-for-linus

   # HEAD: 33d4a5a7a5b4d02915d765064b2319e90a11cbde cpu/hotplug: Fix 
out-of-bounds read when setting fail state

Two fixes:

 - Fix an out of bounds access when writing nonsensical values to 
   /sys/devices/system/cpu/cpuX/hotplug/fail

 - Warn about unsupported mitigations= parameters.

 Thanks,

        Ingo

------------------>
Eiichi Tsukata (1):
      cpu/hotplug: Fix out-of-bounds read when setting fail state

Geert Uytterhoeven (1):
      cpu/speculation: Warn on unsupported mitigations= parameter


 kernel/cpu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 077fde6fb953..ef1c565edc5d 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1964,6 +1964,9 @@ static ssize_t write_cpuhp_fail(struct device *dev,
        if (ret)
                return ret;
 
+       if (fail < CPUHP_OFFLINE || fail > CPUHP_ONLINE)
+               return -EINVAL;
+
        /*
         * Cannot fail STARTING/DYING callbacks.
         */
@@ -2339,6 +2342,9 @@ static int __init mitigations_parse_cmdline(char *arg)
                cpu_mitigations = CPU_MITIGATIONS_AUTO;
        else if (!strcmp(arg, "auto,nosmt"))
                cpu_mitigations = CPU_MITIGATIONS_AUTO_NOSMT;
+       else
+               pr_crit("Unsupported mitigations=%s, system may still be 
vulnerable\n",
+                       arg);
 
        return 0;
 }