Commit 26db9c9e authored by Matt Johnston's avatar Matt Johnston Committed by Jakub Kicinski
Browse files

net: mctp i3c: Copy headers if cloned 



Use skb_cow_head() prior to modifying the tx skb. This is necessary
when the skb has been cloned, to avoid modifying other shared clones.

Signed-off-by: default avatarMatt Johnston <matt@codeconstruct.com.au>
Fixes: c8755b29 ("mctp i3c: MCTP I3C driver")
Link: https://patch.msgid.link/20250306-matt-i3c-cow-head-v1-1-d5e6a5495227@codeconstruct.com.au


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent dc5340c3

drivers/net/mctp/mctp-i3c.c

+5 −0
Original line number Diff line number Diff line
@@ -506,10 +506,15 @@ static int mctp_i3c_header_create(struct sk_buff *skb, struct net_device *dev, 
	   const void *saddr, unsigned int len)

{

	struct mctp_i3c_internal_hdr *ihdr;

	int rc;



	if (!daddr || !saddr)

		return -EINVAL;



	rc = skb_cow_head(skb, sizeof(struct mctp_i3c_internal_hdr));

	if (rc)

		return rc;



	skb_push(skb, sizeof(struct mctp_i3c_internal_hdr));

	skb_reset_mac_header(skb);

	ihdr = (void *)skb_mac_header(skb);