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| author | Vlad Yasevich <vladislav.yasevich@hp.com> | 2009-11-11 11:19:24 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-11-14 06:56:51 +0300 |
| commit | f9c67811ebc00a42f62f5d542d3abd36bd49ae35 (patch) | |
| tree | f58d9f0c0ae23ded2f758b73e2c47a97a25376a3 /net | |
| parent | 409b95aff3583c05ac7a9247fa3d8c9aa7f9cae3 (diff) | |
| download | linux-f9c67811ebc00a42f62f5d542d3abd36bd49ae35.tar.xz | |
sctp: Fix regression introduced by new sctp_connectx api
A new (unrealeased to the user) sctp_connectx api
c6ba68a26645dbc5029a9faa5687ebe6fcfc53e4
sctp: support non-blocking version of the new sctp_connectx() API
introduced a regression cought by the user regression test
suite. In particular, the API requires the user library to
re-allocate the buffer and could potentially trigger a SIGFAULT.
This change corrects that regression by passing the original
address buffer to the kernel unmodified, but still allows for
a returned association id.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sctp/socket.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c index bf705ba97231..3a95fcb17a9e 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -1276,22 +1276,30 @@ SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk, } /* - * New (hopefully final) interface for the API. The option buffer is used - * both for the returned association id and the addresses. + * New (hopefully final) interface for the API. + * We use the sctp_getaddrs_old structure so that use-space library + * can avoid any unnecessary allocations. The only defferent part + * is that we store the actual length of the address buffer into the + * addrs_num structure member. That way we can re-use the existing + * code. */ SCTP_STATIC int sctp_getsockopt_connectx3(struct sock* sk, int len, char __user *optval, int __user *optlen) { + struct sctp_getaddrs_old param; sctp_assoc_t assoc_id = 0; int err = 0; - if (len < sizeof(assoc_id)) + if (len < sizeof(param)) return -EINVAL; + if (copy_from_user(¶m, optval, sizeof(param))) + return -EFAULT; + err = __sctp_setsockopt_connectx(sk, - (struct sockaddr __user *)(optval + sizeof(assoc_id)), - len - sizeof(assoc_id), &assoc_id); + (struct sockaddr __user *)param.addrs, + param.addr_num, &assoc_id); if (err == 0 || err == -EINPROGRESS) { if (copy_to_user(optval, &assoc_id, sizeof(assoc_id))) |