change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/net/ipv6/exthdrs.c
..
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@@ -552,24 +552,6 @@
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 		return -1;
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 	}
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-	if (skb_cloned(skb)) {
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-		if (pskb_expand_head(skb, IPV6_RPL_SRH_WORST_SWAP_SIZE, 0,
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-				     GFP_ATOMIC)) {
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-			__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
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-					IPSTATS_MIB_OUTDISCARDS);
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-			kfree_skb(skb);
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-			return -1;
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-		}
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-	} else {
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-		err = skb_cow_head(skb, IPV6_RPL_SRH_WORST_SWAP_SIZE);
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-		if (unlikely(err)) {
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-			kfree_skb(skb);
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-			return -1;
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-		}
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-	}
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-
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-	hdr = (struct ipv6_rpl_sr_hdr *)skb_transport_header(skb);
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-
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 	if (!pskb_may_pull(skb, ipv6_rpl_srh_size(n, hdr->cmpri,
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 						  hdr->cmpre))) {
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 		kfree_skb(skb);
..
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@@ -615,6 +597,17 @@
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 	skb_pull(skb, ((hdr->hdrlen + 1) << 3));
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 	skb_postpull_rcsum(skb, oldhdr,
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 			   sizeof(struct ipv6hdr) + ((hdr->hdrlen + 1) << 3));
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+	if (unlikely(!hdr->segments_left)) {
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+		if (pskb_expand_head(skb, sizeof(struct ipv6hdr) + ((chdr->hdrlen + 1) << 3), 0,
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+				     GFP_ATOMIC)) {
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+			__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_OUTDISCARDS);
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+			kfree_skb(skb);
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+			kfree(buf);
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+			return -1;
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+		}
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+
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+		oldhdr = ipv6_hdr(skb);
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+	}
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 	skb_push(skb, ((chdr->hdrlen + 1) << 3) + sizeof(struct ipv6hdr));
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 	skb_reset_network_header(skb);
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 	skb_mac_header_rebuild(skb);