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vhost: reject zero size iova range

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[ Upstream commit 813dbeb656d6c90266f251d8bd2b02d445afa63f ]

We used to accept zero size iova range which will lead a infinite loop
in translate_desc(). Fixing this by failing the request in this case.

Reported-by: syzbot+d21e6e297322a900c128@syzkaller.appspotmail.com
Fixes: 6b1e6cc7 ("vhost: new device IOTLB API")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason Wang 2019-04-09 12:10:25 +08:00 committed by Greg Kroah-Hartman
parent 8530cf625d
commit c5bbedac8a
1 changed files with 5 additions and 1 deletions
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6
drivers/vhost/vhost.c
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@ -863,8 +863,12 @@ static int vhost_new_umem_range(struct vhost_umem *umem,
u64 start, u64 size, u64 end,
u64 userspace_addr, int perm)
{
struct vhost_umem_node *tmp, *node = kmalloc(sizeof(*node), GFP_ATOMIC);
struct vhost_umem_node *tmp, *node;
if (!size)
return -EFAULT;
node = kmalloc(sizeof(*node), GFP_ATOMIC);
if (!node)
return -ENOMEM;