[PATCH 5.10 107/202] net: ipv4: fix return value check in esp_remove_trailer

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ma Ke <make_ruc2021@xxxxxxx>

commit 513f61e2193350c7a345da98559b80f61aec4fa6 upstream.

In esp_remove_trailer(), to avoid an unexpected result returned by
pskb_trim, we should check the return value of pskb_trim().

Signed-off-by: Ma Ke <make_ruc2021@xxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv4/esp4.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -741,7 +741,9 @@ static inline int esp_remove_trailer(str
 		skb->csum = csum_block_sub(skb->csum, csumdiff,
 					   skb->len - trimlen);
 	}
-	pskb_trim(skb, skb->len - trimlen);
+	ret = pskb_trim(skb, skb->len - trimlen);
+	if (unlikely(ret))
+		return ret;
 
 	ret = nexthdr[1];
 





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