netdev - [PATCH net] sctp: fix overrun in sctp_diag_dump

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Date:   Tue, 23 Aug 2016 11:40:52 -0400
From:   Lance Richardson <lrichard@...hat.com>
To:     netdev@...r.kernel.org
Subject: [PATCH net] sctp: fix overrun in sctp_diag_dump_one()

The function sctp_diag_dump_one() currently performs a memcpy()
of 64 bytes from a 16 byte field into another 16 byte field. Fix
by using correct size, use sizeof to obtain correct size instead
of using a hard-coded constant.

Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file")
Signed-off-by: Lance Richardson <lrichard@...hat.com>
---
 net/sctp/sctp_diag.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/sctp/sctp_diag.c b/net/sctp/sctp_diag.c
index bb69153..f3508aa 100644
--- a/net/sctp/sctp_diag.c
+++ b/net/sctp/sctp_diag.c
@@ -424,11 +424,13 @@ static int sctp_diag_dump_one(struct sk_buff *in_skb,
 		paddr.v4.sin_family = AF_INET;
 	} else {
 		laddr.v6.sin6_port = req->id.idiag_sport;
-		memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, 64);
+		memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
+		       sizeof(laddr.v6.sin6_addr));
 		laddr.v6.sin6_family = AF_INET6;
 
 		paddr.v6.sin6_port = req->id.idiag_dport;
-		memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, 64);
+		memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
+		       sizeof(paddr.v6.sin6_addr));
 		paddr.v6.sin6_family = AF_INET6;
 	}
 
-- 
2.5.5