migration/dirtyrate: Fix segmentation fault
Since the kvm_dirty_ring_enabled function accesses a null kvm_state
pointer when the KVM acceleration parameter is not specified, running
calc_dirty_rate with the -r or -b option causes a segmentation fault.
Signed-off-by: Masato Imai <mii@sfc.wide.ad.jp>
Message-ID: <20240507025010.1968881-1-mii@sfc.wide.ad.jp>
[Assert kvm_state when kvm_dirty_ring_enabled was called to fix it. - Hyman]
Signed-off-by: Hyman Huang <yong.huang@smartx.com>
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 009b49d..854cb86 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2329,7 +2329,7 @@
bool kvm_dirty_ring_enabled(void)
{
- return kvm_state->kvm_dirty_ring_size ? true : false;
+ return kvm_state && kvm_state->kvm_dirty_ring_size;
}
static void query_stats_cb(StatsResultList **result, StatsTarget target,
