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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/net/ipv4/ah4.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 #define pr_fmt(fmt) "IPsec: " fmt
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 #include <crypto/algapi.h>
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@@ -106,7 +107,7 @@
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 			if (optlen < 6)
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 				return -EINVAL;
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 			memcpy(daddr, optptr+optlen-4, 4);
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-			/* Fall through */
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+			fallthrough;
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 		default:
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 			memset(optptr, 0, optlen);
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 		}
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@@ -461,9 +462,9 @@
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 		return 0;
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 	if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
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-		ipv4_update_pmtu(skb, net, info, 0, 0, IPPROTO_AH, 0);
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+		ipv4_update_pmtu(skb, net, info, 0, IPPROTO_AH);
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 	else
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-		ipv4_redirect(skb, net, 0, 0, IPPROTO_AH, 0);
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+		ipv4_redirect(skb, net, 0, IPPROTO_AH);
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 	xfrm_state_put(x);
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 	return 0;
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@@ -589,8 +590,7 @@
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 {
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 	if (xfrm4_protocol_deregister(&ah4_protocol, IPPROTO_AH) < 0)
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 		pr_info("%s: can't remove protocol\n", __func__);
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-	if (xfrm_unregister_type(&ah_type, AF_INET) < 0)
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-		pr_info("%s: can't remove xfrm type\n", __func__);
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+	xfrm_unregister_type(&ah_type, AF_INET);
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 }
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 module_init(ah4_init);