From 09b5b5fb3902bb206c61daad26d30b803bcadaf5 Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Thu, 7 Jan 2021 15:39:56 +0100 Subject: [PATCH] ppp: clean up endianness conversions sparse complains about some harmless endianness issues: > drivers/net/ppp/pptp.c:281:21: warning: incorrect type in assignment (different base types) > drivers/net/ppp/pptp.c:281:21: expected unsigned int [usertype] ack > drivers/net/ppp/pptp.c:281:21: got restricted __be32 > drivers/net/ppp/pptp.c:283:23: warning: cast to restricted __be32 Here 'ack' is assigned a value in network-order, and then also the byte-swapped value in host-order. Clean this up by doing the byte-swap as part of the assignment. > drivers/net/ppp/pptp.c:358:26: warning: cast from restricted __be16 > drivers/net/ppp/pptp.c:358:26: warning: incorrect type in argument 1 (different base types) > drivers/net/ppp/pptp.c:358:26: expected unsigned short [usertype] call_id > drivers/net/ppp/pptp.c:358:26: got restricted __be16 [usertype] Here we use the wrong flavour of byte-swap. Use ntohs(), which of course gives the same result. Cc: Dmitry Kozlov Signed-off-by: Julian Wiedmann Link: https://lore.kernel.org/r/20210107143956.25549-1-jwi@linux.ibm.com Signed-off-by: Jakub Kicinski --- drivers/net/ppp/pptp.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c index ee5058445d06..0fe78826c8fa 100644 --- a/drivers/net/ppp/pptp.c +++ b/drivers/net/ppp/pptp.c @@ -278,10 +278,8 @@ static int pptp_rcv_core(struct sock *sk, struct sk_buff *skb) header = (struct pptp_gre_header *)(skb->data); /* ack in different place if S = 0 */ - ack = GRE_IS_SEQ(header->gre_hd.flags) ? header->ack : header->seq; - - ack = ntohl(ack); - + ack = GRE_IS_SEQ(header->gre_hd.flags) ? ntohl(header->ack) : + ntohl(header->seq); if (ack > opt->ack_recv) opt->ack_recv = ack; /* also handle sequence number wrap-around */ @@ -355,7 +353,7 @@ static int pptp_rcv(struct sk_buff *skb) /* if invalid, discard this packet */ goto drop; - po = lookup_chan(htons(header->call_id), iph->saddr); + po = lookup_chan(ntohs(header->call_id), iph->saddr); if (po) { skb_dst_drop(skb); nf_reset_ct(skb);