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staging: lustre: libcfs: check mask returned by cpumask_of_node

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cpumask_of_node can return NULL if NUMA node is unavailable,
in this case cfs_node_to_cpumask will try to copy from NULL
and cause kernel panic.

Signed-off-by: Liang Zhen <liang.zhen@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5751
Reviewed-on: http://review.whamcloud.com/13207
Reviewed-by: Li Wei <wei.g.li@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Liang Zhen 2016-09-18 16:38:40 -04:00 committed by Greg Kroah-Hartman
parent 6314ccb684
commit c658b69656
1 changed files with 14 additions and 3 deletions
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17
drivers/staging/lustre/lnet/libcfs/linux/linux-cpu.c
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@ -74,6 +74,17 @@ struct cfs_cpt_data {
static struct cfs_cpt_data cpt_data;
static void
cfs_node_to_cpumask(int node, cpumask_t *mask)
{
const cpumask_t *tmp = cpumask_of_node(node);
if (tmp)
cpumask_copy(mask, tmp);
else
cpumask_clear(mask);
}
void
cfs_cpt_table_free(struct cfs_cpt_table *cptab)
{
@ -403,7 +414,7 @@ cfs_cpt_set_node(struct cfs_cpt_table *cptab, int cpt, int node)
mutex_lock(&cpt_data.cpt_mutex);
mask = cpt_data.cpt_cpumask;
cpumask_copy(mask, cpumask_of_node(node));
cfs_node_to_cpumask(node, mask);
rc = cfs_cpt_set_cpumask(cptab, cpt, mask);
@ -427,7 +438,7 @@ cfs_cpt_unset_node(struct cfs_cpt_table *cptab, int cpt, int node)
mutex_lock(&cpt_data.cpt_mutex);
mask = cpt_data.cpt_cpumask;
cpumask_copy(mask, cpumask_of_node(node));
cfs_node_to_cpumask(node, mask);
cfs_cpt_unset_cpumask(cptab, cpt, mask);
@ -749,7 +760,7 @@ cfs_cpt_table_create(int ncpt)
}
for_each_online_node(i) {
cpumask_copy(mask, cpumask_of_node(i));
cfs_node_to_cpumask(i, mask);
while (!cpumask_empty(mask)) {
struct cfs_cpu_partition *part;