fix qemu memory leak in block interface

the qemu block interface leaks memory every time a read or write request
is issued, this patch fixes it.
This is also the bug that is causing stubdomains to crash under high
disk IO.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
(cherry picked from commit 9c58cf9321f746b223bdd778c49c31ff756b6b1b)

diff --git a/block.c b/block.c
index 36f5eb919dc29d40475982ceecf4789b4f21c585..6ce453c762cfb4abd53bf222fbaa81d0cd1c6101 100644 (file)
--- a/block.c
+++ b/block.c
@@ -1378,6 +1378,7 @@ static void bdrv_aio_rw_vector_cb(void *opaque, int ret)
     qemu_vfree(s->bounce);
     s->this_aiocb->cb(s->this_aiocb->opaque, ret);
     qemu_aio_release(s->this_aiocb);
+    qemu_free(s);
 }
 
 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,