[PATCH] net: add missing skb_uarg refcount increment in pskb_carve_inside_header()

[Miaohe Lin]

If the skb is zcopied, we should increase the skb_uarg refcount before we
involve skb_release_data(). See pskb_expand_head() as a reference.

Fixes: 6fa01ccd8830 ("skbuff: Add pskb_extract() helper function")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
 net/core/skbuff.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 475f9aa51b57..975600558e8b 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5842,6 +5842,8 @@ static int pskb_carve_inside_header(struct sk_buff *skb, const u32 off,
 			kfree(data);
 			return -ENOMEM;
 		}
+		if (skb_zcopy(skb))
+			refcount_inc(&skb_uarg(skb)->refcnt);
 		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
 			skb_frag_ref(skb, i);
 		if (skb_has_frag_list(skb))
-- 
2.19.1