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Message-ID: <202309191806.9xysweCr-lkp@intel.com>
Date:   Tue, 19 Sep 2023 19:06:43 +0800
From:   kernel test robot <lkp@...el.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: sound/core/ump.c:676:25: warning: array subscript 'struct
 snd_ump_block_info[0]' is partly outside array bounds of 'char[20]'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2cf0f715623872823a72e451243bbf555d10d032
commit: 4a16a3af05712e7fd5a205f34e2908055bd9fb5e ALSA: seq: ump: Handle FB info update
date:   3 months ago
config: x86_64-randconfig-004-20230919 (https://download.01.org/0day-ci/archive/20230919/202309191806.9xysweCr-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230919/202309191806.9xysweCr-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309191806.9xysweCr-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In function 'fill_fb_info',
       inlined from 'is_fb_info_updated.constprop' at sound/core/ump.c:699:2:
>> sound/core/ump.c:676:25: warning: array subscript 'struct snd_ump_block_info[0]' is partly outside array bounds of 'char[20]' [-Warray-bounds]
     676 |         info->direction = buf->fb_info.direction;
         |         ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
   sound/core/ump.c: In function 'is_fb_info_updated.constprop':
   sound/core/ump.c:696:14: note: object 'tmpbuf' of size 20
     696 |         char tmpbuf[offsetof(struct snd_ump_block_info, name)];
         |              ^~~~~~
   In function 'fill_fb_info',
       inlined from 'is_fb_info_updated.constprop' at sound/core/ump.c:699:2:
   sound/core/ump.c:677:23: warning: array subscript 'struct snd_ump_block_info[0]' is partly outside array bounds of 'char[20]' [-Warray-bounds]
     677 |         info->ui_hint = buf->fb_info.ui_hint;
         |         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
   sound/core/ump.c: In function 'is_fb_info_updated.constprop':
   sound/core/ump.c:696:14: note: object 'tmpbuf' of size 20
     696 |         char tmpbuf[offsetof(struct snd_ump_block_info, name)];
         |              ^~~~~~
   In function 'fill_fb_info',
       inlined from 'is_fb_info_updated.constprop' at sound/core/ump.c:699:2:
   sound/core/ump.c:678:27: warning: array subscript 'struct snd_ump_block_info[0]' is partly outside array bounds of 'char[20]' [-Warray-bounds]
     678 |         info->first_group = buf->fb_info.first_group;
         |         ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
   sound/core/ump.c: In function 'is_fb_info_updated.constprop':
   sound/core/ump.c:696:14: note: object 'tmpbuf' of size 20
     696 |         char tmpbuf[offsetof(struct snd_ump_block_info, name)];
         |              ^~~~~~
   In function 'fill_fb_info',
       inlined from 'is_fb_info_updated.constprop' at sound/core/ump.c:699:2:
   sound/core/ump.c:679:26: warning: array subscript 'struct snd_ump_block_info[0]' is partly outside array bounds of 'char[20]' [-Warray-bounds]
     679 |         info->num_groups = buf->fb_info.num_groups;
         |         ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
   sound/core/ump.c: In function 'is_fb_info_updated.constprop':
   sound/core/ump.c:696:14: note: object 'tmpbuf' of size 20
     696 |         char tmpbuf[offsetof(struct snd_ump_block_info, name)];
         |              ^~~~~~
   In function 'fill_fb_info',
       inlined from 'is_fb_info_updated.constprop' at sound/core/ump.c:699:2:
   sound/core/ump.c:680:21: warning: array subscript 'struct snd_ump_block_info[0]' is partly outside array bounds of 'char[20]' [-Warray-bounds]
     680 |         info->flags = buf->fb_info.midi_10;
         |         ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
   sound/core/ump.c: In function 'is_fb_info_updated.constprop':
   sound/core/ump.c:696:14: note: object 'tmpbuf' of size 20
     696 |         char tmpbuf[offsetof(struct snd_ump_block_info, name)];
         |              ^~~~~~
   In function 'fill_fb_info',
       inlined from 'is_fb_info_updated.constprop' at sound/core/ump.c:699:2:
   sound/core/ump.c:681:22: warning: array subscript 'struct snd_ump_block_info[0]' is partly outside array bounds of 'char[20]' [-Warray-bounds]
     681 |         info->active = buf->fb_info.active;
         |         ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
   sound/core/ump.c: In function 'is_fb_info_updated.constprop':
   sound/core/ump.c:696:14: note: object 'tmpbuf' of size 20
     696 |         char tmpbuf[offsetof(struct snd_ump_block_info, name)];
         |              ^~~~~~
   In function 'fill_fb_info',
       inlined from 'is_fb_info_updated.constprop' at sound/core/ump.c:699:2:
   sound/core/ump.c:682:31: warning: array subscript 'struct snd_ump_block_info[0]' is partly outside array bounds of 'char[20]' [-Warray-bounds]
     682 |         info->midi_ci_version = buf->fb_info.midi_ci_version;
         |         ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   sound/core/ump.c: In function 'is_fb_info_updated.constprop':
   sound/core/ump.c:696:14: note: object 'tmpbuf' of size 20
     696 |         char tmpbuf[offsetof(struct snd_ump_block_info, name)];
         |              ^~~~~~
   In function 'fill_fb_info',
       inlined from 'is_fb_info_updated.constprop' at sound/core/ump.c:699:2:
   sound/core/ump.c:683:30: warning: array subscript 'struct snd_ump_block_info[0]' is partly outside array bounds of 'char[20]' [-Warray-bounds]
     683 |         info->sysex8_streams = buf->fb_info.sysex8_streams;
         |         ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   sound/core/ump.c: In function 'is_fb_info_updated.constprop':
   sound/core/ump.c:696:14: note: object 'tmpbuf' of size 20
     696 |         char tmpbuf[offsetof(struct snd_ump_block_info, name)];
         |              ^~~~~~


vim +676 sound/core/ump.c

37e0e14128e068 Takashi Iwai 2023-06-12  670  
37e0e14128e068 Takashi Iwai 2023-06-12  671  /* Extract Function Block info from UMP packet */
37e0e14128e068 Takashi Iwai 2023-06-12  672  static void fill_fb_info(struct snd_ump_endpoint *ump,
37e0e14128e068 Takashi Iwai 2023-06-12  673  			 struct snd_ump_block_info *info,
37e0e14128e068 Takashi Iwai 2023-06-12  674  			 const union snd_ump_stream_msg *buf)
37e0e14128e068 Takashi Iwai 2023-06-12  675  {
37e0e14128e068 Takashi Iwai 2023-06-12 @676  	info->direction = buf->fb_info.direction;
37e0e14128e068 Takashi Iwai 2023-06-12  677  	info->ui_hint = buf->fb_info.ui_hint;
37e0e14128e068 Takashi Iwai 2023-06-12  678  	info->first_group = buf->fb_info.first_group;
37e0e14128e068 Takashi Iwai 2023-06-12  679  	info->num_groups = buf->fb_info.num_groups;
37e0e14128e068 Takashi Iwai 2023-06-12  680  	info->flags = buf->fb_info.midi_10;
37e0e14128e068 Takashi Iwai 2023-06-12  681  	info->active = buf->fb_info.active;
37e0e14128e068 Takashi Iwai 2023-06-12  682  	info->midi_ci_version = buf->fb_info.midi_ci_version;
37e0e14128e068 Takashi Iwai 2023-06-12  683  	info->sysex8_streams = buf->fb_info.sysex8_streams;
37e0e14128e068 Takashi Iwai 2023-06-12  684  
37e0e14128e068 Takashi Iwai 2023-06-12  685  	ump_dbg(ump, "FB %d: dir=%d, active=%d, first_gp=%d, num_gp=%d, midici=%d, sysex8=%d, flags=0x%x\n",
37e0e14128e068 Takashi Iwai 2023-06-12  686  		info->block_id, info->direction, info->active,
37e0e14128e068 Takashi Iwai 2023-06-12  687  		info->first_group, info->num_groups, info->midi_ci_version,
37e0e14128e068 Takashi Iwai 2023-06-12  688  		info->sysex8_streams, info->flags);
37e0e14128e068 Takashi Iwai 2023-06-12  689  }
37e0e14128e068 Takashi Iwai 2023-06-12  690  

:::::: The code at line 676 was first introduced by commit
:::::: 37e0e14128e0685267dc5c037bf655421a6ce2ea ALSA: ump: Support UMP Endpoint and Function Block parsing

:::::: TO: Takashi Iwai <tiwai@...e.de>
:::::: CC: Takashi Iwai <tiwai@...e.de>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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