From 69a6a0b38a139ccceef32222108caca8a9b0b795 Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Sun, 7 Feb 2010 20:20:28 +0000 Subject: dccp: allow probing of CCID-array length This fixes a problem in the DCCP getsockopt() API: currently there is no way for a user to a priori know the number of built-in CCIDs, other than trying DCCP_SOCKOPT_AVAILABLE_CCIDS in a loop, incrementing the option length until EINVAL is no longer returned. This patch truncates the array to the user-provided length. No copy is made when the length is <= 0. Due to the length restriction in do_dccp_getsockopt() to sizeof(int), the minimum array length remains 4, which is a reasonable default (only 3 CCIDs, CCID-2..4, are currently defined). Signed-off-by: Gerrit Renker Signed-off-by: David S. Miller --- net/dccp/ccid.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'net') diff --git a/net/dccp/ccid.c b/net/dccp/ccid.c index ff16e9df196..49d27c556be 100644 --- a/net/dccp/ccid.c +++ b/net/dccp/ccid.c @@ -63,14 +63,13 @@ int ccid_getsockopt_builtin_ccids(struct sock *sk, int len, u8 *ccid_array, array_len; int err = 0; - if (len < ARRAY_SIZE(ccids)) - return -EINVAL; - if (ccid_get_builtin_ccids(&ccid_array, &array_len)) return -ENOBUFS; - if (put_user(array_len, optlen) || - copy_to_user(optval, ccid_array, array_len)) + if (put_user(array_len, optlen)) + err = -EFAULT; + else if (len > 0 && copy_to_user(optval, ccid_array, + len > array_len ? array_len : len)) err = -EFAULT; kfree(ccid_array); -- cgit v1.2.3