target/linux/generic/backport-5.4/080-wireguard-0079-wireguard-queueing-do-not-account-for-pfmemalloc-whe.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Thu, 2 Jan 2020 17:47:50 +0100
   4 Subject: [PATCH] wireguard: queueing: do not account for pfmemalloc when
   5  clearing skb header
   6
   7 commit 04d2ea92a18417619182cbb79063f154892b0150 upstream.
   8
   9 Before 8b7008620b84 ("net: Don't copy pfmemalloc flag in __copy_skb_
  10 header()"), the pfmemalloc flag used to be between headers_start and
  11 headers_end, which is a region we clear when preparing the packet for
  12 encryption/decryption. This is a parameter we certainly want to
  13 preserve, which is why 8b7008620b84 moved it out of there. The code here
  14 was written in a world before 8b7008620b84, though, where we had to
  15 manually account for it. This commit brings things up to speed.
  16
  17 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  18 Signed-off-by: David S. Miller <davem@davemloft.net>
  19 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  20 ---
  21  drivers/net/wireguard/queueing.h | 3 ---
  22  1 file changed, 3 deletions(-)
  23
  24 --- a/drivers/net/wireguard/queueing.h
  25 +++ b/drivers/net/wireguard/queueing.h
  26 @@ -83,13 +83,10 @@ static inline __be16 wg_skb_examine_untr
  27
  28  static inline void wg_reset_packet(struct sk_buff *skb)
  29  {
  30 -       const int pfmemalloc = skb->pfmemalloc;
  31 -
  32         skb_scrub_packet(skb, true);
  33         memset(&skb->headers_start, 0,
  34                offsetof(struct sk_buff, headers_end) -
  35                        offsetof(struct sk_buff, headers_start));
  36 -       skb->pfmemalloc = pfmemalloc;
  37         skb->queue_mapping = 0;
  38         skb->nohdr = 0;
  39         skb->peeked = 0;