DCCP: Fix exploitable hole in DCCP socket options

[DCCP] getsockopt: Fix DCCP_SOCKOPT_[SEND,RECV]_CSCOV

We were only checking if there was enough space to put the int, but
left len as specified by the (malicious) user, sigh, fix it by setting
len to sizeof(val) and transfering just one int worth of data, the one
asked for.

Also check for negative len values.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 63b3fa20e14bbb718d3baa9a7a16c2bcb1a503bd..88ed359b606cc5a40d94e0e497ec5ca0862cf425 100644 (file)
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -575,7 +575,7 @@ static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
        if (get_user(len, optlen))
                return -EFAULT;
 
-       if (len < sizeof(int))
+       if (len < (int)sizeof(int))
                return -EINVAL;
 
        dp = dccp_sk(sk);
@@ -589,9 +589,11 @@ static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
                                               (__be32 __user *)optval, optlen);
        case DCCP_SOCKOPT_SEND_CSCOV:
                val = dp->dccps_pcslen;
+               len = sizeof(val);
                break;
        case DCCP_SOCKOPT_RECV_CSCOV:
                val = dp->dccps_pcrlen;
+               len = sizeof(val);
                break;
        case 128 ... 191:
                return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,