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helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 9/25/2025 10:25 PM, Zhenzhong Duan wrote: > After CPR transfer, source QEMU close kvm fd and free kvm_state, > "query-balloon" will check kvm_state->sync_mmu and trigger NULL > pointer reference. > > Signed-off-by: Zhenzhong Duan Reviewed-by: Steve Sistare > --- > accel/kvm/kvm-all.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c > index 9060599cd7..a3e2d11763 100644 > --- a/accel/kvm/kvm-all.c > +++ b/accel/kvm/kvm-all.c > @@ -3479,7 +3479,7 @@ int kvm_device_access(int fd, int group, uint64_t attr, > > bool kvm_has_sync_mmu(void) > { > - return kvm_state->sync_mmu; > + return kvm_state && kvm_state->sync_mmu; > } > > int kvm_has_vcpu_events(void)