tjh.dev / kernel
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net: clear skb->sk in skb_release_head_state()

skb_release_head_state() inlines skb_orphan().

We need to clear skb->sk otherwise we can freeze TCP flows
on a mostly idle host, because skb_fclone_busy() would
return true as long as the packet is not yet processed by
skb_defer_free_flush().

Fixes: 1fcf572211da ("net: allow skb_release_head_state() to be called multiple times")
Fixes: e20dfbad8aab ("net: fix napi_consume_skb() with alien skbs")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Tested-by: Aditya Garg <gargaditya@linux.microsoft.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20251111151235.1903659-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Eric Dumazet and committed by
Jakub Kicinski 26b8986a 4001bda0

+1
+1
net/core/skbuff.c
··· 1152 1152 1153 1153 #endif 1154 1154 skb->destructor = NULL; 1155 + skb->sk = NULL; 1155 1156 } 1156 1157 nf_reset_ct(skb); 1157 1158 skb_ext_reset(skb);