From: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> 3.12-stable review patch. If anyone has any objections, please let me know. =============== commit 421b8f20d3c381b215f988b42428f56fc3b82405 upstream. It may happen that not all CPUs are online when we do hv_synic_alloc() and in case more CPUs come online later we may try accessing these allocated structures. Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> --- drivers/hv/hv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 88f4096fa078..3fdb9af08705 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -271,7 +271,7 @@ int hv_synic_alloc(void) size_t size = sizeof(struct tasklet_struct); int cpu; - for_each_online_cpu(cpu) { + for_each_present_cpu(cpu) { hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC); if (hv_context.event_dpc[cpu] == NULL) { pr_err("Unable to allocate event dpc\n"); @@ -314,7 +314,7 @@ void hv_synic_free(void) { int cpu; - for_each_online_cpu(cpu) + for_each_present_cpu(cpu) hv_synic_free_cpu(cpu); } -- 2.12.0