Re: [PATCH] net/switchdev: use struct_size over open coded arithmetic
From: kernel test robot
Date: Fri Jan 28 2022 - 12:13:55 EST
Hi,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v5.17-rc1 next-20220128]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/cgel-zte-gmail-com/net-switchdev-use-struct_size-over-open-coded-arithmetic/20220128-155848
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 23a46422c56144939c091c76cf389aa863ce9c18
config: i386-randconfig-a005 (https://download.01.org/0day-ci/archive/20220129/202201290005.GR1IxnQb-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
# https://github.com/0day-ci/linux/commit/bf0e33a8c3deb700b95173a37dd16754341ba70e
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review cgel-zte-gmail-com/net-switchdev-use-struct_size-over-open-coded-arithmetic/20220128-155848
git checkout bf0e33a8c3deb700b95173a37dd16754341ba70e
# save the config file to linux build tree
mkdir build_dir
make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All errors (new ones prefixed by >>):
In file included from include/linux/mm.h:30,
from arch/x86/include/asm/cacheflush.h:5,
from include/linux/cacheflush.h:5,
from include/linux/highmem.h:8,
from include/linux/bvec.h:10,
from include/linux/skbuff.h:17,
from include/net/net_namespace.h:40,
from include/linux/netdevice.h:37,
from net/switchdev/switchdev.c:13:
net/switchdev/switchdev.c: In function 'switchdev_deferred_enqueue':
>> include/linux/overflow.h:194:18: error: invalid type argument of '->' (have 'struct switchdev_deferred_item')
194 | sizeof(*(p)->member) + __must_be_array((p)->member),\
| ^~
net/switchdev/switchdev.c:88:19: note: in expansion of macro 'struct_size'
88 | dfitem = kmalloc(struct_size(*dfitem, data, data_len), GFP_ATOMIC);
| ^~~~~~~~~~~
In file included from include/linux/container_of.h:5,
from include/linux/kernel.h:21,
from net/switchdev/switchdev.c:8:
include/linux/overflow.h:194:49: error: invalid type argument of '->' (have 'struct switchdev_deferred_item')
194 | sizeof(*(p)->member) + __must_be_array((p)->member),\
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:258:46: note: in expansion of macro '__same_type'
258 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:194:30: note: in expansion of macro '__must_be_array'
194 | sizeof(*(p)->member) + __must_be_array((p)->member),\
| ^~~~~~~~~~~~~~~
net/switchdev/switchdev.c:88:19: note: in expansion of macro 'struct_size'
88 | dfitem = kmalloc(struct_size(*dfitem, data, data_len), GFP_ATOMIC);
| ^~~~~~~~~~~
include/linux/overflow.h:194:49: error: invalid type argument of '->' (have 'struct switchdev_deferred_item')
194 | sizeof(*(p)->member) + __must_be_array((p)->member),\
| ^~
include/linux/build_bug.h:16:62: note: in definition of macro 'BUILD_BUG_ON_ZERO'
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:258:46: note: in expansion of macro '__same_type'
258 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~
include/linux/overflow.h:194:30: note: in expansion of macro '__must_be_array'
194 | sizeof(*(p)->member) + __must_be_array((p)->member),\
| ^~~~~~~~~~~~~~~
net/switchdev/switchdev.c:88:19: note: in expansion of macro 'struct_size'
88 | dfitem = kmalloc(struct_size(*dfitem, data, data_len), GFP_ATOMIC);
| ^~~~~~~~~~~
include/linux/build_bug.h:16:51: error: bit-field '<anonymous>' width not an integer constant
16 | #define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
| ^
include/linux/compiler.h:258:28: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
258 | #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
| ^~~~~~~~~~~~~~~~~
include/linux/overflow.h:194:30: note: in expansion of macro '__must_be_array'
194 | sizeof(*(p)->member) + __must_be_array((p)->member),\
| ^~~~~~~~~~~~~~~
net/switchdev/switchdev.c:88:19: note: in expansion of macro 'struct_size'
88 | dfitem = kmalloc(struct_size(*dfitem, data, data_len), GFP_ATOMIC);
| ^~~~~~~~~~~
In file included from include/linux/mm.h:30,
from arch/x86/include/asm/cacheflush.h:5,
from include/linux/cacheflush.h:5,
from include/linux/highmem.h:8,
from include/linux/bvec.h:10,
from include/linux/skbuff.h:17,
from include/net/net_namespace.h:40,
from include/linux/netdevice.h:37,
from net/switchdev/switchdev.c:13:
>> include/linux/overflow.h:195:14: error: invalid type argument of unary '*' (have 'struct switchdev_deferred_item')
195 | sizeof(*(p)))
| ^~~~
net/switchdev/switchdev.c:88:19: note: in expansion of macro 'struct_size'
88 | dfitem = kmalloc(struct_size(*dfitem, data, data_len), GFP_ATOMIC);
| ^~~~~~~~~~~
vim +194 include/linux/overflow.h
610b15c50e86eb Kees Cook 2018-05-07 180
610b15c50e86eb Kees Cook 2018-05-07 181 /**
610b15c50e86eb Kees Cook 2018-05-07 182 * struct_size() - Calculate size of structure with trailing array.
610b15c50e86eb Kees Cook 2018-05-07 183 * @p: Pointer to the structure.
610b15c50e86eb Kees Cook 2018-05-07 184 * @member: Name of the array member.
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 185 * @count: Number of elements in the array.
610b15c50e86eb Kees Cook 2018-05-07 186 *
610b15c50e86eb Kees Cook 2018-05-07 187 * Calculates size of memory needed for structure @p followed by an
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 188 * array of @count number of @member elements.
610b15c50e86eb Kees Cook 2018-05-07 189 *
610b15c50e86eb Kees Cook 2018-05-07 190 * Return: number of bytes needed or SIZE_MAX on overflow.
610b15c50e86eb Kees Cook 2018-05-07 191 */
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 192 #define struct_size(p, member, count) \
b19d57d0f3cc6f Gustavo A. R. Silva 2020-06-08 193 __ab_c_size(count, \
610b15c50e86eb Kees Cook 2018-05-07 @194 sizeof(*(p)->member) + __must_be_array((p)->member),\
610b15c50e86eb Kees Cook 2018-05-07 @195 sizeof(*(p)))
610b15c50e86eb Kees Cook 2018-05-07 196
---
0-DAY CI Kernel Test Service, Intel Corporation
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