Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 108/153] hv: allocate synic pages for all present CPUs | Date | Fri, 10 Mar 2017 10:09:01 +0100 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: Vitaly Kuznetsov <vkuznets@redhat.com>
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@redhat.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/hv/hv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -411,7 +411,7 @@ int hv_synic_alloc(void) goto err; } - 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"); @@ -482,7 +482,7 @@ void hv_synic_free(void) int cpu; kfree(hv_context.hv_numa_map); - for_each_online_cpu(cpu) + for_each_present_cpu(cpu) hv_synic_free_cpu(cpu); }
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