kernel: add missing check for TCP GRO

Need to check if the skb data buffer is linear up to (and including) the TCP
header.

Fixes: https://github.com/openwrt/openwrt/issues/15359
Signed-off-by: Felix Fietkau <[email protected]>

target/linux/generic/pending-6.1/680-net-add-TCP-fraglist-GRO-support.patch

@@ -318,7 +318,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
  	flush = NAPI_GRO_CB(p)->flush;
  	flush |= (__force int)(flags & TCP_FLAG_CWR);
  	flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
-@@ -268,6 +350,18 @@ found:
+@@ -268,6 +350,19 @@ found:
  	flush |= p->decrypted ^ skb->decrypted;
  #endif
  
@@ -326,6 +326,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
 +		flush |= (__force int)(flags ^ tcp_flag_word(th2));
 +		flush |= skb->ip_summed != p->ip_summed;
 +		flush |= skb->csum_level != p->csum_level;
++		flush |= !pskb_may_pull(skb, skb_gro_offset(skb));
 +		flush |= NAPI_GRO_CB(p)->count >= 64;
 +
 +		if (flush || skb_gro_receive_list(p, skb))
@@ -337,7 +338,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
  	if (flush || skb_gro_receive(p, skb)) {
  		mss = 1;
  		goto out_check_final;
-@@ -289,7 +383,6 @@ out_check_final:
+@@ -289,7 +384,6 @@ out_check_final:
  	if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
  		pp = p;
  
@@ -345,7 +346,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
  	NAPI_GRO_CB(skb)->flush |= (flush != 0);
  
  	return pp;
-@@ -315,18 +408,58 @@ int tcp_gro_complete(struct sk_buff *skb
+@@ -315,18 +409,58 @@ int tcp_gro_complete(struct sk_buff *skb
  }
  EXPORT_SYMBOL(tcp_gro_complete);
  
@@ -409,7 +410,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
  }
  
  INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
-@@ -334,6 +467,15 @@ INDIRECT_CALLABLE_SCOPE int tcp4_gro_com
+@@ -334,6 +468,15 @@ INDIRECT_CALLABLE_SCOPE int tcp4_gro_com
  	const struct iphdr *iph = ip_hdr(skb);
  	struct tcphdr *th = tcp_hdr(skb);
  

target/linux/generic/pending-6.6/680-net-add-TCP-fraglist-GRO-support.patch

@@ -269,7 +269,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
  	flush = NAPI_GRO_CB(p)->flush;
  	flush |= (__force int)(flags & TCP_FLAG_CWR);
  	flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
-@@ -269,6 +351,18 @@ found:
+@@ -269,6 +351,19 @@ found:
  	flush |= p->decrypted ^ skb->decrypted;
  #endif
  
@@ -277,6 +277,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
 +		flush |= (__force int)(flags ^ tcp_flag_word(th2));
 +		flush |= skb->ip_summed != p->ip_summed;
 +		flush |= skb->csum_level != p->csum_level;
++		flush |= !pskb_may_pull(skb, skb_gro_offset(skb));
 +		flush |= NAPI_GRO_CB(p)->count >= 64;
 +
 +		if (flush || skb_gro_receive_list(p, skb))
@@ -288,7 +289,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
  	if (flush || skb_gro_receive(p, skb)) {
  		mss = 1;
  		goto out_check_final;
-@@ -290,7 +384,6 @@ out_check_final:
+@@ -290,7 +385,6 @@ out_check_final:
  	if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
  		pp = p;
  
@@ -296,7 +297,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
  	NAPI_GRO_CB(skb)->flush |= (flush != 0);
  
  	return pp;
-@@ -314,18 +407,58 @@ void tcp_gro_complete(struct sk_buff *sk
+@@ -314,18 +408,58 @@ void tcp_gro_complete(struct sk_buff *sk
  }
  EXPORT_SYMBOL(tcp_gro_complete);
  
@@ -360,7 +361,7 @@ Signe-off-by: Felix Fietkau <[email protected]>
  }
  
  INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
-@@ -333,6 +466,15 @@ INDIRECT_CALLABLE_SCOPE int tcp4_gro_com
+@@ -333,6 +467,15 @@ INDIRECT_CALLABLE_SCOPE int tcp4_gro_com
  	const struct iphdr *iph = ip_hdr(skb);
  	struct tcphdr *th = tcp_hdr(skb);