From 398999bac6ea8842706d613630f907b817f47c6d Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Thu, 1 Oct 2020 19:21:26 +0200 Subject: [PATCH] net/af_iucv: right-size the uid variable in iucv_sock_bind() smatch complains about net/iucv/af_iucv.c:624 iucv_sock_bind() error: memcpy() 'sa->siucv_user_id' too small (8 vs 9) Which is absolutely correct - the memcpy() takes 9 bytes (sizeof(uid)) from an 8-byte field (sa->siucv_user_id). Luckily the sockaddr_iucv struct contains more data after the .siucv_user_id field, and we checked the size of the passed data earlier on. So the memcpy() won't accidentally read from an invalid location. Fix the warning by reducing the size of the uid variable to what's actually needed, and thus reducing the amount of copied data. Signed-off-by: Julian Wiedmann Reviewed-by: Karsten Graul Signed-off-by: David S. Miller --- net/iucv/af_iucv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index a95af62..d805720 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -588,11 +588,11 @@ static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) { struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; + char uid[sizeof(sa->siucv_user_id)]; struct sock *sk = sock->sk; struct iucv_sock *iucv; int err = 0; struct net_device *dev; - char uid[9]; /* Verify the input sockaddr */ if (addr_len < sizeof(struct sockaddr_iucv) || -- 2.7.4