5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sven Eckelmann 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: stable@vger.kernel.org Reported-by: Sashiko Fixes: 5c3a0e553593 ("batman-adv: Distributed ARP Table - add ARP parsing functions") Signed-off-by: Sven Eckelmann Signed-off-by: Greg Kroah-Hartman --- 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 @@ -251,7 +251,10 @@ 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); } /** @@ -276,8 +279,9 @@ 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); } /**