target/linux/generic/backport-5.4/080-wireguard-0100-wireguard-selftests-initalize-ipv6-members-to-NULL-t.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Wed, 6 May 2020 15:33:05 -0600
   4 Subject: [PATCH] wireguard: selftests: initalize ipv6 members to NULL to
   5  squelch clang warning
   6
   7 commit 4fed818ef54b08d4b29200e416cce65546ad5312 upstream.
   8
   9 Without setting these to NULL, clang complains in certain
  10 configurations that have CONFIG_IPV6=n:
  11
  12 In file included from drivers/net/wireguard/ratelimiter.c:223:
  13 drivers/net/wireguard/selftest/ratelimiter.c:173:34: error: variable 'skb6' is uninitialized when used here [-Werror,-Wuninitialized]
  14                 ret = timings_test(skb4, hdr4, skb6, hdr6, &test_count);
  15                                                ^~~~
  16 drivers/net/wireguard/selftest/ratelimiter.c:123:29: note: initialize the variable 'skb6' to silence this warning
  17         struct sk_buff *skb4, *skb6;
  18                                    ^
  19                                     = NULL
  20 drivers/net/wireguard/selftest/ratelimiter.c:173:40: error: variable 'hdr6' is uninitialized when used here [-Werror,-Wuninitialized]
  21                 ret = timings_test(skb4, hdr4, skb6, hdr6, &test_count);
  22                                                      ^~~~
  23 drivers/net/wireguard/selftest/ratelimiter.c:125:22: note: initialize the variable 'hdr6' to silence this warning
  24         struct ipv6hdr *hdr6;
  25                             ^
  26
  27 We silence this warning by setting the variables to NULL as the warning
  28 suggests.
  29
  30 Reported-by: Arnd Bergmann <arnd@arndb.de>
  31 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  32 Signed-off-by: David S. Miller <davem@davemloft.net>
  33 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  34 ---
  35  drivers/net/wireguard/selftest/ratelimiter.c | 4 ++--
  36  1 file changed, 2 insertions(+), 2 deletions(-)
  37
  38 --- a/drivers/net/wireguard/selftest/ratelimiter.c
  39 +++ b/drivers/net/wireguard/selftest/ratelimiter.c
  40 @@ -120,9 +120,9 @@ bool __init wg_ratelimiter_selftest(void
  41         enum { TRIALS_BEFORE_GIVING_UP = 5000 };
  42         bool success = false;
  43         int test = 0, trials;
  44 -       struct sk_buff *skb4, *skb6;
  45 +       struct sk_buff *skb4, *skb6 = NULL;
  46         struct iphdr *hdr4;
  47 -       struct ipv6hdr *hdr6;
  48 +       struct ipv6hdr *hdr6 = NULL;
  49
  50         if (IS_ENABLED(CONFIG_KASAN) || IS_ENABLED(CONFIG_UBSAN))
  51                 return true;