From b40db6846847e82daf175641987df29324c425fa Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Wed, 27 Feb 2008 14:40:37 -0500 Subject: [PATCH] [SCTP]: Incorrect length was used in SCTP_*_AUTH_CHUNKS socket option The chunks are stored inside a parameter structure in the kernel and when we copy them to the user, we need to account for the parameter header. Signed-off-by: Vlad Yasevich --- net/sctp/socket.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 44797ad88a..848df21dc6 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -5070,6 +5070,7 @@ static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len, struct sctp_authchunks val; struct sctp_association *asoc; struct sctp_chunks_param *ch; + u32 num_chunks; char __user *to; if (len <= sizeof(struct sctp_authchunks)) @@ -5086,10 +5087,11 @@ static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len, ch = asoc->peer.peer_chunks; /* See if the user provided enough room for all the data */ - if (len < ntohs(ch->param_hdr.length)) + num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t); + if (len < num_chunks) return -EINVAL; - len = ntohs(ch->param_hdr.length); + len = num_chunks; if (put_user(len, optlen)) return -EFAULT; if (copy_to_user(to, ch->chunks, len)) @@ -5105,6 +5107,7 @@ static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len, struct sctp_authchunks val; struct sctp_association *asoc; struct sctp_chunks_param *ch; + u32 num_chunks; char __user *to; if (len <= sizeof(struct sctp_authchunks)) @@ -5123,10 +5126,11 @@ static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len, else ch = sctp_sk(sk)->ep->auth_chunk_list; - if (len < ntohs(ch->param_hdr.length)) + num_chunks = ntohs(ch->param_hdr.length) - sizeof(sctp_paramhdr_t); + if (len < num_chunks) return -EINVAL; - len = ntohs(ch->param_hdr.length); + len = num_chunks; if (put_user(len, optlen)) return -EFAULT; if (copy_to_user(to, ch->chunks, len)) -- 2.39.5