5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sven Eckelmann <sven@narfation.org>
commit 0121afa52cdb88cfb4d5d7bd126a23a9100121d8 upstream.
Independent of the alignment of the ARP packet in the SKB, either the
batadv_arp_ip_src or the batadv_arp_ip_dst will have an unaligned access
(on HW without native unaligned read support).
Use get_unaligned() to handle this properly on all architectures.
Cc: <redacted>
Reported-by: Sashiko <sashiko-bot@kernel.org>
Fixes: 5c3a0e553593 ("batman-adv: Distributed ARP Table - add ARP parsing functions")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/batman-adv/distributed-arp-table.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -250,7 +250,10 @@ static u8 *batadv_arp_hw_src(struct sk_b
*/
static __be32 batadv_arp_ip_src(struct sk_buff *skb, int hdr_size)
{
- return *(__force __be32 *)(batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN);
+ u8 *src = batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN;
+ __be32 *ip = (__force __be32 *)src;
+
+ return get_unaligned(ip);
}
/**@@ -275,8 +278,9 @@ static u8 *batadv_arp_hw_dst(struct sk_b
static __be32 batadv_arp_ip_dst(struct sk_buff *skb, int hdr_size)
{
u8 *dst = batadv_arp_hw_src(skb, hdr_size) + ETH_ALEN * 2 + 4;
+ __be32 *ip = (__force __be32 *)dst;
- return *(__force __be32 *)dst;
+ return get_unaligned(ip);
}
/**