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net: mctp i3c: Copy headers if cloned

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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: Matt Johnston <matt@codeconstruct.com.au>
Fixes: c8755b29b5 ("mctp i3c: MCTP I3C driver")
Link: https://patch.msgid.link/20250306-matt-i3c-cow-head-v1-1-d5e6a5495227@codeconstruct.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matt Johnston
2025-03-06 18:24:18 +08:00
committed by Jakub Kicinski
parent dc5340c313
commit 26db9c9ee1
1 changed files with 5 additions and 0 deletions
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5
drivers/net/mctp/mctp-i3c.c
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@@ -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);