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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/can/j1939/transport.c
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@@ -600,7 +600,10 @@
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 	/* reserve CAN header */
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 	skb_reserve(skb, offsetof(struct can_frame, data));
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-	memcpy(skb->cb, re_skcb, sizeof(skb->cb));
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+	/* skb->cb must be large enough to hold a j1939_sk_buff_cb structure */
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+	BUILD_BUG_ON(sizeof(skb->cb) < sizeof(*re_skcb));
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+
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+	memcpy(skb->cb, re_skcb, sizeof(*re_skcb));
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 	skcb = j1939_skb_to_cb(skb);
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 	if (swap_src_dst)
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 		j1939_skbcb_swap(skcb);
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@@ -1087,10 +1090,6 @@
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 	bool active;
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 	j1939_session_list_lock(priv);
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-	/* This function should be called with a session ref-count of at
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-	 * least 2.
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-	 */
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-	WARN_ON_ONCE(kref_read(&session->kref) < 2);
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 	active = j1939_session_deactivate_locked(session);
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 	j1939_session_list_unlock(priv);
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