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Date:   Wed, 22 Nov 2023 09:47:39 +1100
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: linux-next: build warning after merge of the kspp-gustavo tree
Message-ID: <20231122094739.38465ed3@canb.auug.org.au>
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Hi all,

After merging the kspp-gustavo tree, today's linux-next build (x86_64
allmodconfig) produced this warning:

In file included from include/linux/string.h:295,
                 from include/linux/bitmap.h:12,
                 from include/linux/cpumask.h:12,
                 from arch/x86/include/asm/paravirt.h:17,
                 from arch/x86/include/asm/cpuid.h:62,
                 from arch/x86/include/asm/processor.h:19,
                 from arch/x86/include/asm/cpufeature.h:5,
                 from arch/x86/include/asm/thread_info.h:53,
                 from include/linux/thread_info.h:60,
                 from arch/x86/include/asm/preempt.h:9,
                 from include/linux/preempt.h:79,
                 from include/linux/spinlock.h:56,
                 from include/linux/mmzone.h:8,
                 from include/linux/gfp.h:7,
                 from include/linux/firmware.h:7,
                 from drivers/net/wireless/realtek/rtw89/core.h:10,
                 from drivers/net/wireless/realtek/rtw89/coex.h:8,
                 from drivers/net/wireless/realtek/rtw89/coex.c:5:
drivers/net/wireless/realtek/rtw89/coex.c: In function '_append_tdma':
include/linux/fortify-string.h:57:33: warning: writing 8 bytes into a regio=
n of size 0 [-Wstringop-overflow=3D]
   57 | #define __underlying_memcpy     __builtin_memcpy
      |                                 ^
include/linux/fortify-string.h:644:9: note: in expansion of macro '__underl=
ying_memcpy'
  644 |         __underlying_##op(p, q, __fortify_size);                   =
     \
      |         ^~~~~~~~~~~~~
include/linux/fortify-string.h:689:26: note: in expansion of macro '__forti=
fy_memcpy_chk'
  689 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,             =
     \
      |                          ^~~~~~~~~~~~~~~~~~~~
drivers/net/wireless/realtek/rtw89/coex.c:1585:17: note: in expansion of ma=
cro 'memcpy'
 1585 |                 memcpy(&v3->tdma, &dm->tdma, sizeof(v3->tdma));
      |                 ^~~~~~
drivers/net/wireless/realtek/rtw89/core.h:2703:37: note: at offset [5714, 7=
1249] into destination object 'ver' of size 8
 2703 |         const struct rtw89_btc_ver *ver;
      |                                     ^~~
include/linux/fortify-string.h:57:33: warning: writing 8 bytes into a regio=
n of size 0 [-Wstringop-overflow=3D]
   57 | #define __underlying_memcpy     __builtin_memcpy
      |                                 ^
include/linux/fortify-string.h:644:9: note: in expansion of macro '__underl=
ying_memcpy'
  644 |         __underlying_##op(p, q, __fortify_size);                   =
     \
      |         ^~~~~~~~~~~~~
include/linux/fortify-string.h:689:26: note: in expansion of macro '__forti=
fy_memcpy_chk'
  689 | #define memcpy(p, q, s)  __fortify_memcpy_chk(p, q, s,             =
     \
      |                          ^~~~~~~~~~~~~~~~~~~~
drivers/net/wireless/realtek/rtw89/coex.c:1579:17: note: in expansion of ma=
cro 'memcpy'
 1579 |                 memcpy(v, &dm->tdma, sizeof(*v));
      |                 ^~~~~~
drivers/net/wireless/realtek/rtw89/core.h:2703:37: note: at offset [5710, 7=
1245] into destination object 'ver' of size 8
 2703 |         const struct rtw89_btc_ver *ver;
      |                                     ^~~

Exposed by commit

  1b56c90018f0 ("Makefile: Enable -Wstringop-overflow globally")

This is with your tree on top of Linus' tree (and some fix patches but
nothing that obviously touches anything relevent) and CONFIG_WERROR
not set.

--=20
Cheers,
Stephen Rothwell

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