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virtio/virtio_mem: handle a possible NULL as a memcpy parameter

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There is a check for vm->sbm.sb_states before, and it should check
it here as well.

Signed-off-by: Peng Hao <flyingpeng@tencent.com>
Link: https://lore.kernel.org/r/20211222011225.40573-1-flyingpeng@tencent.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Fixes: 5f1f79bbc9 ("virtio-mem: Paravirtualized memory hotplug")
Cc: stable@vger.kernel.org # v5.8+
This commit is contained in:
Peng Hao 2021-12-22 09:12:25 +08:00 committed by Michael S. Tsirkin
parent 2b68224ec6
commit cf4a4493ff
1 changed files with 1 additions and 1 deletions
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2
drivers/virtio/virtio_mem.c
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@ -593,7 +593,7 @@ static int virtio_mem_sbm_sb_states_prepare_next_mb(struct virtio_mem *vm)
return -ENOMEM;
mutex_lock(&vm->hotplug_mutex);
if (new_bitmap)
if (vm->sbm.sb_states)
memcpy(new_bitmap, vm->sbm.sb_states, old_pages * PAGE_SIZE);
old_bitmap = vm->sbm.sb_states;