drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c:932:2: warning: 'strncpy' specified bound 128 equals destination size

From: kernel test robot
Date: Sat Oct 17 2020 - 01:52:16 EST

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Hi Jacopo,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8119c4332d253660e0a6b8748fe0749961cfbc97
commit: b18ee53ad297264a79cf4ea566663f20786b6455 staging: bcm2835: Break MMAL support out from camera
date: 4 months ago
config: nds32-randconfig-r026-20201017 (attached as .config)
compiler: nds32le-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b18ee53ad297264a79cf4ea566663f20786b6455
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout b18ee53ad297264a79cf4ea566663f20786b6455
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from include/linux/kernel.h:11,
from drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c:19:
include/linux/dma-mapping.h: In function 'dma_map_resource':
arch/nds32/include/asm/memory.h:82:32: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
82 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
| ^~
include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var'
58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~
include/linux/dma-mapping.h:352:2: note: in expansion of macro 'if'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~
include/linux/dma-mapping.h:352:6: note: in expansion of macro 'WARN_ON_ONCE'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~~~~~~~~~~~
include/linux/dma-mapping.h:352:19: note: in expansion of macro 'pfn_valid'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~~~~~~~~
arch/nds32/include/asm/memory.h:82:32: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
82 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
| ^~
include/linux/compiler.h:58:61: note: in definition of macro '__trace_if_var'
58 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~
include/linux/dma-mapping.h:352:2: note: in expansion of macro 'if'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~
include/linux/dma-mapping.h:352:6: note: in expansion of macro 'WARN_ON_ONCE'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~~~~~~~~~~~
include/linux/dma-mapping.h:352:19: note: in expansion of macro 'pfn_valid'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~~~~~~~~
arch/nds32/include/asm/memory.h:82:32: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
82 | #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
| ^~
include/linux/compiler.h:69:3: note: in definition of macro '__trace_if_value'
69 | (cond) ? \
| ^~~~
include/linux/compiler.h:56:28: note: in expansion of macro '__trace_if_var'
56 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~
include/linux/dma-mapping.h:352:2: note: in expansion of macro 'if'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~
include/linux/dma-mapping.h:352:6: note: in expansion of macro 'WARN_ON_ONCE'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~~~~~~~~~~~
include/linux/dma-mapping.h:352:19: note: in expansion of macro 'pfn_valid'
352 | if (WARN_ON_ONCE(pfn_valid(PHYS_PFN(phys_addr))))
| ^~~~~~~~~
drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c: In function 'create_component':
>> drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c:932:2: warning: 'strncpy' specified bound 128 equals destination size [-Wstringop-truncation]
932 | strncpy(m.u.component_create.name, name,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
933 | sizeof(m.u.component_create.name));
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/strncpy +932 drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c

7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 918
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 919 /* create comonent on vc */
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 920 static int create_component(struct vchiq_mmal_instance *instance,
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 921 struct vchiq_mmal_component *component,
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 922 const char *name)
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 923 {
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 924 int ret;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 925 struct mmal_msg m;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 926 struct mmal_msg *rmsg;
9d4d3ac473912a2 drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c Dominic Braun 2018-12-14 927 struct vchi_held_msg rmsg_handle;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 928
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 929 /* build component create message */
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 930 m.h.type = MMAL_MSG_TYPE_COMPONENT_CREATE;
4fe08093094e5f6 drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c Michael Zoran 2017-03-09 931 m.u.component_create.client_component = (u32)(unsigned long)component;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 @932 strncpy(m.u.component_create.name, name,
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 933 sizeof(m.u.component_create.name));
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 934
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 935 ret = send_synchronous_mmal_msg(instance, &m,
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 936 sizeof(m.u.component_create),
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 937 &rmsg, &rmsg_handle);
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 938 if (ret)
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 939 return ret;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 940
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 941 if (rmsg->h.type != m.h.type) {
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 942 /* got an unexpected message type in reply */
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 943 ret = -EINVAL;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 944 goto release_msg;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 945 }
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 946
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 947 ret = -rmsg->u.component_create_reply.status;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 948 if (ret != MMAL_MSG_STATUS_SUCCESS)
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 949 goto release_msg;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 950
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 951 /* a valid component response received */
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 952 component->handle = rmsg->u.component_create_reply.component_handle;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 953 component->inputs = rmsg->u.component_create_reply.input_num;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 954 component->outputs = rmsg->u.component_create_reply.output_num;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 955 component->clocks = rmsg->u.component_create_reply.clock_num;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 956
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 957 pr_debug("Component handle:0x%x in:%d out:%d clock:%d\n",
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 958 component->handle,
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 959 component->inputs, component->outputs, component->clocks);
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 960
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 961 release_msg:
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 962 vchi_held_msg_release(&rmsg_handle);
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 963
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 964 return ret;
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 965 }
7b3ad5abf027b76 drivers/staging/media/platform/bcm2835/mmal-vchiq.c Eric Anholt 2017-01-27 966

:::::: The code at line 932 was first introduced by commit
:::::: 7b3ad5abf027b7643b38c4006d7f4ce47a86dd3a staging: Import the BCM2835 MMAL-based V4L2 camera driver.

:::::: TO: Eric Anholt <eric@xxxxxxxxxx>
:::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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