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| author | Jason Wang <jasowang@redhat.com> | 2019-04-09 07:10:25 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-27 10:36:31 +0300 |
| commit | b82df42059fb90862505eb071dd0dd225a2791df (patch) | |
| tree | b8a40b2f16246c6744f6d2acf46a72d0cd6eeb03 /drivers/vhost | |
| parent | 242e5746cb477bdb4c59d0f2d3c5a3e1c0a10629 (diff) | |
| download | linux-b82df42059fb90862505eb071dd0dd225a2791df.tar.xz | |
vhost: reject zero size iova range
[ 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>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vhost.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index b214a72d5caa..c163bc15976a 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -911,8 +911,12 @@ 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; |