In function virtio_blk_handle_request, it may freed memory pointed by req, So do not access member of req after calling this function.
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com> Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com> --- hw/block/virtio-blk.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index c241c50..54a853a 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -458,7 +458,7 @@ static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) static void virtio_blk_dma_restart_bh(void *opaque) { VirtIOBlock *s = opaque; - VirtIOBlockReq *req = s->rq; + VirtIOBlockReq *req = s->rq, *next = NULL; MultiReqBuffer mrb = { .num_writes = 0, }; @@ -469,8 +469,9 @@ static void virtio_blk_dma_restart_bh(void *opaque) s->rq = NULL; while (req) { + next = req->next; virtio_blk_handle_request(req, &mrb); - req = req->next; + req = next; } virtio_submit_multiwrite(s->bs, &mrb); -- 1.7.12.4