4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jon Maloy donmalo99@gmail.com
[ Upstream commit 1c1274a56999fbdf9cf84e332b28448bb2d55221 ]
The code for reading ancillary data from a received buffer is assuming the buffer is linear. To make this assumption true we have to linearize the buffer before message data is read.
Signed-off-by: Jon Maloy jon.maloy@ericsson.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/tipc/socket.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)
--- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1548,16 +1548,17 @@ static void tipc_sk_set_orig_addr(struct /** * tipc_sk_anc_data_recv - optionally capture ancillary data for received message * @m: descriptor for message info - * @msg: received message header + * @skb: received message buffer * @tsk: TIPC port associated with message * * Note: Ancillary data is not captured if not requested by receiver. * * Returns 0 if successful, otherwise errno */ -static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg, +static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb, struct tipc_sock *tsk) { + struct tipc_msg *msg; u32 anc_data[3]; u32 err; u32 dest_type; @@ -1566,6 +1567,7 @@ static int tipc_sk_anc_data_recv(struct
if (likely(m->msg_controllen == 0)) return 0; + msg = buf_msg(skb);
/* Optionally capture errored message object(s) */ err = msg ? msg_errcode(msg) : 0; @@ -1576,6 +1578,9 @@ static int tipc_sk_anc_data_recv(struct if (res) return res; if (anc_data[1]) { + if (skb_linearize(skb)) + return -ENOMEM; + msg = buf_msg(skb); res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], msg_data(msg)); if (res) @@ -1737,9 +1742,10 @@ static int tipc_recvmsg(struct socket *s
/* Collect msg meta data, including error code and rejected data */ tipc_sk_set_orig_addr(m, skb); - rc = tipc_sk_anc_data_recv(m, hdr, tsk); + rc = tipc_sk_anc_data_recv(m, skb, tsk); if (unlikely(rc)) goto exit; + hdr = buf_msg(skb);
/* Capture data if non-error msg, otherwise just set return value */ if (likely(!err)) { @@ -1849,9 +1855,10 @@ static int tipc_recvstream(struct socket /* Collect msg meta data, incl. error code and rejected data */ if (!copied) { tipc_sk_set_orig_addr(m, skb); - rc = tipc_sk_anc_data_recv(m, hdr, tsk); + rc = tipc_sk_anc_data_recv(m, skb, tsk); if (rc) break; + hdr = buf_msg(skb); }
/* Copy data if msg ok, otherwise return error/partial data */