From: Sven Eckelmann <sven@narfation.org>
To: b.a.t.m.a.n@lists.open-mesh.org
Subject: [PATCH] batman-adv: Annotate bitwise integer pointer casts
Date: Thu, 28 Nov 2019 12:55:58 +0100 [thread overview]
Message-ID: <20191128115558.9435-1-sven@narfation.org> (raw)
The sparse commit 6002ded74587 ("add a flag to warn on casts to/from
bitwise pointers") introduced a check for non-direct casts from/to
restricted datatypes (when -Wbitwise-pointer is enabled).
This triggered various warnings in batman-adv when some (already big
endian) buffer content was casted to/from the corresponding big endian
integer data types. But these were correct and can therefore be marked with
__force to signalize sparse an intended cast from/to a bitwise type.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
net/batman-adv/bridge_loop_avoidance.c | 2 +-
net/batman-adv/distributed-arp-table.c | 8 +++++---
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/net/batman-adv/bridge_loop_avoidance.c b/net/batman-adv/bridge_loop_avoidance.c
index 663a53b6..0eff3358 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -844,7 +844,7 @@ static bool batadv_handle_announce(struct batadv_priv *bat_priv, u8 *an_addr,
/* handle as ANNOUNCE frame */
backbone_gw->lasttime = jiffies;
- crc = ntohs(*((__be16 *)(&an_addr[4])));
+ crc = ntohs(*((__force __be16 *)(&an_addr[4])));
batadv_dbg(BATADV_DBG_BLA, bat_priv,
"%s(): ANNOUNCE vid %d (sent by %pM)... CRC = %#.4x\n",
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index b0af3a11..5004e38f 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -246,7 +246,7 @@ static u8 *batadv_arp_hw_src(struct sk_buff *skb, int hdr_size)
*/
static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size)
{
- return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN);
+ return *(__force __be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN);
}
/**
@@ -270,7 +270,9 @@ static u8 *batadv_arp_hw_dst(struct sk_buff *skb, int hdr_size)
*/
static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size)
{
- return *(__be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN * 2 + 4);
+ u8 *dst = batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN * 2 + 4;
+
+ return *(__force __be32 *)dst;
}
/**
@@ -287,7 +289,7 @@ static u32 batadv_hash_dat(const void *data, u32 size)
const unsigned char *key;
u32 i;
- key = (const unsigned char *)&dat->ip;
+ key = (__force const unsigned char *)&dat->ip;
for (i = 0; i < sizeof(dat->ip); i++) {
hash += key[i];
hash += (hash << 10);
--
2.20.1
reply other threads:[~2019-11-28 11:55 UTC|newest]
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