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authorMathias Krause <minipli@googlemail.com>2013-04-07 01:52:01 +0000
committerDavid S. Miller <davem@davemloft.net>2013-04-07 16:28:02 -0400
commit680d04e0ba7e926233e3b9cee59125ce181f66ba (patch)
treebd075aa2f2b87d1b6f019baaee2cbb89cb4ba388 /net
parent60085c3d009b0df252547adb336d1ccca5ce52ec (diff)
downloadvexpress-lsk-680d04e0ba7e926233e3b9cee59125ce181f66ba.tar.gz
VSOCK: vmci - fix possible info leak in vmci_transport_dgram_dequeue()
In case we received no data on the call to skb_recv_datagram(), i.e. skb->data is NULL, vmci_transport_dgram_dequeue() will return with 0 without updating msg_namelen leading to net/socket.c leaking the local, uninitialized sockaddr_storage variable to userland -- 128 bytes of kernel stack memory. Fix this by moving the already existing msg_namelen assignment a few lines above. Cc: Andy King <acking@vmware.com> Cc: Dmitry Torokhov <dtor@vmware.com> Cc: George Zhang <georgezhang@vmware.com> Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/vmw_vsock/vmci_transport.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
index 1f6508e249a..5e04d3d9628 100644
--- a/net/vmw_vsock/vmci_transport.c
+++ b/net/vmw_vsock/vmci_transport.c
@@ -1736,6 +1736,8 @@ static int vmci_transport_dgram_dequeue(struct kiocb *kiocb,
if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
return -EOPNOTSUPP;
+ msg->msg_namelen = 0;
+
/* Retrieve the head sk_buff from the socket's receive queue. */
err = 0;
skb = skb_recv_datagram(&vsk->sk, flags, noblock, &err);
@@ -1768,7 +1770,6 @@ static int vmci_transport_dgram_dequeue(struct kiocb *kiocb,
if (err)
goto out;
- msg->msg_namelen = 0;
if (msg->msg_name) {
struct sockaddr_vm *vm_addr;