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net: ipv6: rpl_iptunnel: Fix memory leak in rpl_input

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Free the skb before returning from rpl_input when skb_cow_head() fails.
Use a "drop" label and goto instructions.

Fixes: a7a29f9c36 ("net: ipv6: add rpl sr tunnel")
Signed-off-by: Justin Iurman <justin.iurman@uliege.be>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240911174557.11536-1-justin.iurman@uliege.be
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Justin Iurman 2024-09-11 19:45:57 +02:00 committed by Jakub Kicinski
parent b9c7ac4fe2
commit 2c84b0aa28
1 changed files with 7 additions and 5 deletions
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12
net/ipv6/rpl_iptunnel.c
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@ -263,10 +263,8 @@ static int rpl_input(struct sk_buff *skb)
rlwt = rpl_lwt_lwtunnel(orig_dst->lwtstate);
err = rpl_do_srh(skb, rlwt);
if (unlikely(err)) {
kfree_skb(skb);
return err;
}
if (unlikely(err))
goto drop;
local_bh_disable();
dst = dst_cache_get(&rlwt->cache);
@ -286,9 +284,13 @@ static int rpl_input(struct sk_buff *skb)
err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
if (unlikely(err))
return err;
goto drop;
return dst_input(skb);
drop:
kfree_skb(skb);
return err;
}
static int nla_put_rpl_srh(struct sk_buff *skb, int attrtype,