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net: mctp i2c: 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: f5b8abf9fc ("mctp i2c: MCTP I2C binding driver")
Link: https://patch.msgid.link/20250306-matt-mctp-i2c-cow-v1-1-293827212681@codeconstruct.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Matt Johnston
2025-03-06 10:33:20 +08:00
committed by Jakub Kicinski
parent 26db9c9ee1
commit df8ce77ba8
1 changed files with 5 additions and 0 deletions
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5
drivers/net/mctp/mctp-i2c.c
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@@ -583,6 +583,7 @@ static int mctp_i2c_header_create(struct sk_buff *skb, struct net_device *dev,
struct mctp_i2c_hdr *hdr;
struct mctp_hdr *mhdr;
u8 lldst, llsrc;
int rc;
if (len > MCTP_I2C_MAXMTU)
return -EMSGSIZE;
@@ -593,6 +594,10 @@ static int mctp_i2c_header_create(struct sk_buff *skb, struct net_device *dev,
lldst = *((u8 *)daddr);
llsrc = *((u8 *)saddr);
rc = skb_cow_head(skb, sizeof(struct mctp_i2c_hdr));
if (rc)
return rc;
skb_push(skb, sizeof(struct mctp_i2c_hdr));
skb_reset_mac_header(skb);
hdr = (void *)skb_mac_header(skb);