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Date:   Sat, 22 Aug 2020 16:07:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: drivers/staging/vc04_services/vchiq-mmal/mmal-vchiq.c:932:2:
 warning: 'strncpy' specified bound 128 equals destination size

Hi Jacopo,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   f873db9acd3c92d4741bc3676c9eb511b2f9a6f6
commit: b18ee53ad297264a79cf4ea566663f20786b6455 staging: bcm2835: Break MMAL support out from camera
date:   8 weeks ago
config: ia64-randconfig-r035-20200822 (attached as .config)
compiler: ia64-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
        git checkout b18ee53ad297264a79cf4ea566663f20786b6455
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 

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

All warnings (new ones prefixed by >>):

   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));
         |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  918  
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  919  /* create comonent on vc */
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  920  static int create_component(struct vchiq_mmal_instance *instance,
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  921  			    struct vchiq_mmal_component *component,
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  922  			    const char *name)
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  923  {
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  924  	int ret;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  925  	struct mmal_msg m;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  926  	struct mmal_msg *rmsg;
9d4d3ac473912a drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c Dominic Braun 2018-12-14  927  	struct vchi_held_msg rmsg_handle;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  928  
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  929  	/* build component create message */
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  930  	m.h.type = MMAL_MSG_TYPE_COMPONENT_CREATE;
4fe08093094e5f 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;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27 @932  	strncpy(m.u.component_create.name, name,
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  933  		sizeof(m.u.component_create.name));
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  934  
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  935  	ret = send_synchronous_mmal_msg(instance, &m,
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  936  					sizeof(m.u.component_create),
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  937  					&rmsg, &rmsg_handle);
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  938  	if (ret)
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  939  		return ret;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  940  
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  941  	if (rmsg->h.type != m.h.type) {
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  942  		/* got an unexpected message type in reply */
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  943  		ret = -EINVAL;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  944  		goto release_msg;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  945  	}
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  946  
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  947  	ret = -rmsg->u.component_create_reply.status;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  948  	if (ret != MMAL_MSG_STATUS_SUCCESS)
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  949  		goto release_msg;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  950  
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  951  	/* a valid component response received */
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  952  	component->handle = rmsg->u.component_create_reply.component_handle;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  953  	component->inputs = rmsg->u.component_create_reply.input_num;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  954  	component->outputs = rmsg->u.component_create_reply.output_num;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  955  	component->clocks = rmsg->u.component_create_reply.clock_num;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  956  
7b3ad5abf027b7 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",
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  958  		 component->handle,
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  959  		 component->inputs, component->outputs, component->clocks);
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  960  
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  961  release_msg:
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  962  	vchi_held_msg_release(&rmsg_handle);
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  963  
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  964  	return ret;
7b3ad5abf027b7 drivers/staging/media/platform/bcm2835/mmal-vchiq.c       Eric Anholt   2017-01-27  965  }
7b3ad5abf027b7 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@...olt.net>
:::::: CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

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