From: Li hangjing <lihangjing@baidu.com>
To: <qemu-devel@nongnu.org>, <stefanha@redhat.com>
Cc: lihangjing@baidu.com, xieyongji@baidu.com,
qemu-stable@nongnu.org, chaiwen@baidu.com
Subject: [PATCH] virtio-blk: fix out-of-bounds access to bitmap in notify_guest_bh
Date: Mon, 16 Dec 2019 10:30:50 +0800 [thread overview]
Message-ID: <20191216023050.48620-1-lihangjing@baidu.com> (raw)
From: Li Hangjing <lihangjing@baidu.com>
When the number of a virtio-blk device's virtqueues is larger than
BITS_PER_LONG, the out-of-bounds access to bitmap[ ] will occur.
Fixes: e21737ab15 ("virtio-blk: multiqueue batch notify")
Cc: qemu-stable@nongnu.org
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Li Hangjing <lihangjing@baidu.com>
Reviewed-by: Xie Yongji <xieyongji@baidu.com>
Reviewed-by: Chai Wen <chaiwen@baidu.com>
---
hw/block/dataplane/virtio-blk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
index 119906a5fe..1b52e8159c 100644
--- a/hw/block/dataplane/virtio-blk.c
+++ b/hw/block/dataplane/virtio-blk.c
@@ -67,7 +67,7 @@ static void notify_guest_bh(void *opaque)
memset(s->batch_notify_vqs, 0, sizeof(bitmap));
for (j = 0; j < nvqs; j += BITS_PER_LONG) {
- unsigned long bits = bitmap[j];
+ unsigned long bits = bitmap[j / BITS_PER_LONG];
while (bits != 0) {
unsigned i = j + ctzl(bits);
--
2.15.1.windows.2
next reply other threads:[~2019-12-16 2:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-16 2:30 Li hangjing [this message]
2019-12-19 16:21 ` [PATCH] virtio-blk: fix out-of-bounds access to bitmap in notify_guest_bh Stefan Hajnoczi
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