netdev - [PATCH net 2/2] net: Call skb destructor on NAPI_GRO_FREE_STOLEN

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Date:   Tue, 17 Nov 2020 12:33:55 -0800
From:   Saeed Mahameed <saeedm@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
        "Maxim Mikityanskiy" <maximmi@...lanox.com>,
        Tariq Toukan <tariqt@...dia.com>,
        "Saeed Mahameed" <saeedm@...dia.com>
Subject: [PATCH net 2/2] net: Call skb destructor on NAPI_GRO_FREE_STOLEN_HEAD

From: Maxim Mikityanskiy <maximmi@...lanox.com>

All GRO flows except one call skb->destructor, however, GRO_MERGED_FREE
doesn't do it in case of NAPI_GRO_FREE_STOLEN_HEAD. For better
consistency and to add resiliency against the drivers that may pass SKBs
with a destructor, this patch changes napi_skb_free_stolen_head to use
skb_release_head_state, which should perform all the needed cleanups,
including a call to the destructor. This way the code of GRO_MERGED_FREE
becomes similar to kfree_skb_partial.

Fixes: e44699d2c280 ("net: handle NAPI_GRO_FREE_STOLEN_HEAD case also in napi_frags_finish()")
Fixes: d7e8883cfcf4 ("net: make GRO aware of skb->head_frag")
Signed-off-by: Maxim Mikityanskiy <maximmi@...lanox.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
For -stable: 5.4

 net/core/dev.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 82dc6b48e45f..85dcc7f19902 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6048,8 +6048,7 @@ EXPORT_SYMBOL(gro_find_complete_by_type);
 
 static void napi_skb_free_stolen_head(struct sk_buff *skb)
 {
-	skb_dst_drop(skb);
-	skb_ext_put(skb);
+	skb_release_head_state(skb);
 	kmem_cache_free(skbuff_head_cache, skb);
 }
 
-- 
2.26.2