From: Chad Goodman <chad.goodman@gmail.com>
Date: Mon, 10 Dec 2012 06:11:16 +0000 (-0800)
Subject: SCHED: fix OOPS when build_sched_domains percpu allocation fails
X-Git-Url: https://www.ziggy471.com/git/gitweb.cgi?p=ziggy471-sgn2-jb.git;a=commitdiff;h=3e368304995d146638d8a8ee615768a9a1641d53

SCHED: fix OOPS when build_sched_domains percpu allocation fails

Signed-off-by: Ziggy <ziggy@ziggy471.com>
---

--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7413,16 +7413,26 @@ static void __sdt_free(const struct cpum
 		struct sd_data *sdd = &tl->data;
 
 		for_each_cpu(j, cpu_map) {
-			struct sched_domain *sd = *per_cpu_ptr(sdd->sd, j);
-			if (sd && (sd->flags & SD_OVERLAP))
-				free_sched_groups(sd->groups, 0);
-			kfree(*per_cpu_ptr(sdd->sd, j));
-			kfree(*per_cpu_ptr(sdd->sg, j));
-			kfree(*per_cpu_ptr(sdd->sgp, j));
+			struct sched_domain *sd;
+
+			if (sdd->sd) {
+				sd = *per_cpu_ptr(sdd->sd, j);
+				if (sd && (sd->flags & SD_OVERLAP))
+					free_sched_groups(sd->groups, 0);
+				kfree(*per_cpu_ptr(sdd->sd, j));
+			}
+
+			if (sdd->sg)
+				kfree(*per_cpu_ptr(sdd->sg, j));
+			if (sdd->sgp)
+				kfree(*per_cpu_ptr(sdd->sgp, j));
 		}
 		free_percpu(sdd->sd);
+		sdd->sd = NULL;
 		free_percpu(sdd->sg);
+		sdd->sg = NULL;
 		free_percpu(sdd->sgp);
+		sdd->sgp = NULL;
 	}
 }