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quorum: fix quorum_aio_cancel()

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For a fifo read pattern, we only have one running aio (possible other cases that
has less number than num_children in the future), so we need to check if
.acb is NULL against bdrv_aio_cancel() to avoid segfault.

Cc: Eric Blake <eblake@redhat.com>
Cc: Benoit Canet <benoit@irqsave.net>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Liu Yuan <namei.unix@gmail.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Liu Yuan 2014-09-11 13:41:21 +08:00 committed by Stefan Hajnoczi
parent 533ffb17a5
commit 997dd8df3e
1 changed files with 3 additions and 1 deletions
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4
block/quorum.c
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@ -138,7 +138,9 @@ static void quorum_aio_cancel(BlockDriverAIOCB *blockacb)
/* cancel all callbacks */
for (i = 0; i < s->num_children; i++) {
bdrv_aio_cancel(acb->qcrs[i].aiocb);
if (acb->qcrs[i].aiocb) {
bdrv_aio_cancel(acb->qcrs[i].aiocb);
}
}
g_free(acb->qcrs);