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authorJon Maloy <donmalo99@gmail.com>2018-11-17 12:17:06 -0500
committerDavid S. Miller <davem@davemloft.net>2018-11-17 22:08:02 -0800
commit1c1274a56999fbdf9cf84e332b28448bb2d55221 (patch)
treef549e0616634b586ea3f8eb5cd2ee0c26113b968 /net/tipc
parenttipc: fix lockdep warning when reinitilaizing sockets (diff)
downloadlinux-dev-1c1274a56999fbdf9cf84e332b28448bb2d55221.tar.xz
linux-dev-1c1274a56999fbdf9cf84e332b28448bb2d55221.zip
tipc: don't assume linear buffer when reading ancillary data
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>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/socket.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 636e6131769d..b57b1be7252b 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1555,16 +1555,17 @@ static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
/**
* 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;
@@ -1573,6 +1574,7 @@ static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
if (likely(m->msg_controllen == 0))
return 0;
+ msg = buf_msg(skb);
/* Optionally capture errored message object(s) */
err = msg ? msg_errcode(msg) : 0;
@@ -1583,6 +1585,9 @@ static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
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)
@@ -1744,9 +1749,10 @@ static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
/* 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)) {
@@ -1856,9 +1862,10 @@ static int tipc_recvstream(struct socket *sock, struct msghdr *m,
/* 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 */