[PATCH 5.2 20/85] sctp: fix the missing put_user when dumping transport thresholds

Greg Kroah-Hartman
2019-09-18T06:24:53Z

From: Xin Long <lucien.xin@gmail.com>

[ Upstream commit f794dc2304d83ab998c2eee5bab0549aff5c53a2 ]

This issue causes SCTP_PEER_ADDR_THLDS sockopt not to be able to dump
a transport thresholds info.

Fix it by adding 'goto' put_user in sctp_getsockopt_paddr_thresholds.

Fixes: 8add543e369d ("sctp: add SCTP_FUTURE_ASSOC for SCTP_PEER_ADDR_THLDS sockopt")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/sctp/socket.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -7176,7 +7176,7 @@ static int sctp_getsockopt_paddr_thresho
val.spt_pathmaxrxt = trans->pathmaxrxt;
val.spt_pathpfthld = trans->pf_retrans;

- return 0;
+ goto out;
}

asoc = sctp_id2assoc(sk, val.spt_assoc_id);
@@ -7194,6 +7194,7 @@ static int sctp_getsockopt_paddr_thresho
val.spt_pathmaxrxt = sp->pathmaxrxt;
}

+out:
if (put_user(len, optlen) || copy_to_user(optval, &val, len))
return -EFAULT;