linux/net/core/sock_destructor.h
Vasily Averin 7f678def99 skb_expand_head() adjust skb->truesize incorrectly
Christoph Paasch reports [1] about incorrect skb->truesize
after skb_expand_head() call in ip6_xmit.
This may happen because of two reasons:
- skb_set_owner_w() for newly cloned skb is called too early,
before pskb_expand_head() where truesize is adjusted for (!skb-sk) case.
- pskb_expand_head() does not adjust truesize in (skb->sk) case.
In this case sk->sk_wmem_alloc should be adjusted too.

[1] https://lkml.org/lkml/2021/8/20/1082

Fixes: f1260ff15a ("skbuff: introduce skb_expand_head()")
Fixes: 2d85a1b31d ("ipv6: ip6_finish_output2: set sk into newly allocated nskb")
Reported-by: Christoph Paasch <christoph.paasch@gmail.com>
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/644330dd-477e-0462-83bf-9f514c41edd1@virtuozzo.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-10-22 12:35:51 -07:00

13 lines
362 B
C

/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _NET_CORE_SOCK_DESTRUCTOR_H
#define _NET_CORE_SOCK_DESTRUCTOR_H
#include <net/tcp.h>
static inline bool is_skb_wmem(const struct sk_buff *skb)
{
return skb->destructor == sock_wfree ||
skb->destructor == __sock_wfree ||
(IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree);
}
#endif