From: tuxoko <tuxoko@gmail.com>
Date: Sat, 8 Oct 2016 03:59:46 +0000 (-0700)
Subject: Fix out-of-bound in per_cpu in spl_random_init
X-Git-Tag: spl-0.7.0-rc2~4
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0d267566650d89bde8bd5ec4665749810d5bafc7;p=spl

Fix out-of-bound in per_cpu in spl_random_init

When iterating per_cpu values, we need to use for_each_possible_cpu. While
NR_CPUS indicates the number of CPU supported by the kernel, it might not
initialize all of them if the kernel decides it's not possible to use them.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Closes #578
---

diff --git a/module/spl/spl-generic.c b/module/spl/spl-generic.c
index c04cb53..ce60963 100644
--- a/module/spl/spl-generic.c
+++ b/module/spl/spl-generic.c
@@ -638,7 +638,7 @@ spl_random_init(void)
 		    "0x%016llx%016llx.", cpu_to_be64(s[0]), cpu_to_be64(s[1]));
 	}
 
-	for (i = 0; i < NR_CPUS; i++) {
+	for_each_possible_cpu(i) {
 		uint64_t *wordp = per_cpu(spl_pseudo_entropy, i);
 
 		spl_rand_jump(s);