[Qemu-devel] [PATCH 12/25] virtio-blk: fix reference a pointer which might be freed

[Michael Roth]

From: zhanghailiang <address@hidden>

In function virtio_blk_handle_request, it may freed memory pointed by req,
So do not access member of req after calling this function.

Cc: address@hidden
Reviewed-by: Michael S. Tsirkin <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: zhanghailiang <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
(cherry picked from commit 1bdb176ac5add5dc9d54a230da7511b66851f1e7)
Signed-off-by: Michael Roth <address@hidden>
---
 hw/block/virtio-blk.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c
index c241c50..0e3925b 100644
--- a/hw/block/virtio-blk.c
+++ b/hw/block/virtio-blk.c
@@ -469,8 +469,9 @@ static void virtio_blk_dma_restart_bh(void *opaque)
     s->rq = NULL;
 
     while (req) {
+        VirtIOBlockReq *next = req->next;
         virtio_blk_handle_request(req, &mrb);
-        req = req->next;
+        req = next;
     }
 
     virtio_submit_multiwrite(s->bs, &mrb);
-- 
1.9.1