netdev - [PATCH net-next] net: fix pointer check in skb_pp_cow

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Message-ID: <25512af3e09befa9dcb2cf3632bdc45b807cf330.1708167716.git.lorenzo@kernel.org>
Date: Sat, 17 Feb 2024 12:12:14 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com,
	kuba@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	hawk@...nel.org,
	ilias.apalodimas@...aro.org,
	linyunsheng@...wei.com,
	toke@...hat.com,
	jwiedmann.dev@...il.com
Subject: [PATCH net-next] net: fix pointer check in skb_pp_cow_data routine

Properly check page pointer returned by page_pool_dev_alloc routine in
skb_pp_cow_data() for non-linear part of the original skb.

Reported-by: Julian Wiedmann <jwiedmann.dev@...il.com>
Closes: https://lore.kernel.org/netdev/cover.1707729884.git.lorenzo@kernel.org/T/#m7d189b0015a7281ed9221903902490c03ed19a7a
Fixes: e6d5dbdd20aa ("xdp: add multi-buff support for xdp running in generic mode")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 net/core/skbuff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 0d9a489e6ae1..6a810c6554eb 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -950,7 +950,7 @@ int skb_pp_cow_data(struct page_pool *pool, struct sk_buff **pskb,
 		truesize = size;
 
 		page = page_pool_dev_alloc(pool, &page_off, &truesize);
-		if (!data) {
+		if (!page) {
 			consume_skb(nskb);
 			return -ENOMEM;
 		}
-- 
2.43.2