From: Xia Fukun xiafukun@huawei.com
hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I6YJJQ CVE: NA
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The function sd_llc_free_all() will be called to release allocated resources when space allocation for the scheduling domain structure fails. However, this function did not check if sd is a null pointer when releasing sdd resources, resulting in an error: "Unable to handle kernel paging request at virtual address".
Fix this issue by adding null pointer discrimination.
Fixes: 79bec4c643fb ("sched/topology: Provide hooks to allocate data shared per LLC") Signed-off-by: Xia Fukun xiafukun@huawei.com Reviewed-by: songping yu yusongping@huawei.com Signed-off-by: Jialin Zhang zhangjialin11@huawei.com --- kernel/sched/topology.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index abdb60ca1c80..0d0f55181961 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -2140,7 +2140,7 @@ static void sd_llc_free_all(const struct cpumask *cpu_map)
for_each_sd_topology(tl) { sdd = &tl->data; - if (!sdd) + if (!sdd || !sdd->sd) continue; for_each_cpu(j, cpu_map) { sd = *per_cpu_ptr(sdd->sd, j);