[tglx-devel:x86/apic 20/33] arch/x86/kernel/apic/io_apic.c:1251:65: sparse: sparse: invalid access past the end of 'entry' (12 16)

[tglx-devel:x86/apic 20/33] arch/x86/kernel/apic/io_apic.c:1251:65: sparse: sparse: invalid access past the end of 'entry' (12 16)

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
TO: Thomas Gleixner <tglx@linutronix.de>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git x86/apic
head:   79dccf5adfcb84abb5644e4349234c4442803c9a
commit: c886de0d40c30285de3a9671558ee48e7b5c83d7 [20/33] x86/ioapic: Cleanup IO/APIC route entry structs
:::::: branch date: 4 hours ago
:::::: commit date: 4 hours ago
config: i386-randconfig-s001-20201023 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-17-g2d3af347-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/commit/?id=c886de0d40c30285de3a9671558ee48e7b5c83d7
        git remote add tglx-devel https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git
        git fetch --no-tags tglx-devel x86/apic
        git checkout c886de0d40c30285de3a9671558ee48e7b5c83d7
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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


"sparse warnings: (new ones prefixed by >>)"
>> arch/x86/kernel/apic/io_apic.c:1251:65: sparse: sparse: invalid access past the end of 'entry' (12 16)
   arch/x86/kernel/apic/io_apic.c:1248:26: sparse: sparse: invalid access past the end of 'entry' (12 16)

vim +/entry +1251 arch/x86/kernel/apic/io_apic.c

17405453f4ad022 Yoshihiro YUNOMAE 2013-08-20  1231  
a44174ee7b38001 Jiang Liu         2015-04-13  1232  static void io_apic_print_entries(unsigned int apic, unsigned int nr_entries)
a44174ee7b38001 Jiang Liu         2015-04-13  1233  {
a44174ee7b38001 Jiang Liu         2015-04-13  1234  	struct IO_APIC_route_entry entry;
c886de0d40c3028 Thomas Gleixner   2020-10-22  1235  	char buf[256];
c886de0d40c3028 Thomas Gleixner   2020-10-22  1236  	int i;
a44174ee7b38001 Jiang Liu         2015-04-13  1237  
a44174ee7b38001 Jiang Liu         2015-04-13  1238  	printk(KERN_DEBUG "IOAPIC %d:\n", apic);
a44174ee7b38001 Jiang Liu         2015-04-13  1239  	for (i = 0; i <= nr_entries; i++) {
a44174ee7b38001 Jiang Liu         2015-04-13  1240  		entry = ioapic_read_entry(apic, i);
a44174ee7b38001 Jiang Liu         2015-04-13  1241  		snprintf(buf, sizeof(buf),
a44174ee7b38001 Jiang Liu         2015-04-13  1242  			 " pin%02x, %s, %s, %s, V(%02X), IRR(%1d), S(%1d)",
335efdf57da39d3 Thomas Gleixner   2015-04-14  1243  			 i,
c886de0d40c3028 Thomas Gleixner   2020-10-22  1244  			 entry.masked ? "disabled" : "enabled ",
c886de0d40c3028 Thomas Gleixner   2020-10-22  1245  			 entry.is_level ? "level" : "edge ",
c886de0d40c3028 Thomas Gleixner   2020-10-22  1246  			 entry.active_low ? "low " : "high",
a44174ee7b38001 Jiang Liu         2015-04-13  1247  			 entry.vector, entry.irr, entry.delivery_status);
c886de0d40c3028 Thomas Gleixner   2020-10-22  1248  		if (entry.ir_format) {
a44174ee7b38001 Jiang Liu         2015-04-13  1249  			printk(KERN_DEBUG "%s, remapped, I(%04X),  Z(%X)\n",
335efdf57da39d3 Thomas Gleixner   2015-04-14  1250  			       buf,
c886de0d40c3028 Thomas Gleixner   2020-10-22 @1251  			       (entry.ir_index_15 << 15) | entry.ir_index_0_14,
c886de0d40c3028 Thomas Gleixner   2020-10-22  1252  				entry.ir_zero);
c886de0d40c3028 Thomas Gleixner   2020-10-22  1253  		} else {
c886de0d40c3028 Thomas Gleixner   2020-10-22  1254  			printk(KERN_DEBUG "%s, %s, D(%02X), M(%1d)\n", buf,
c886de0d40c3028 Thomas Gleixner   2020-10-22  1255  			       entry.dest_mode_logical ? "logical " : "physical",
c886de0d40c3028 Thomas Gleixner   2020-10-22  1256  			       entry.destid_0_7, entry.delivery_mode);
c886de0d40c3028 Thomas Gleixner   2020-10-22  1257  		}
a44174ee7b38001 Jiang Liu         2015-04-13  1258  	}
a44174ee7b38001 Jiang Liu         2015-04-13  1259  }
a44174ee7b38001 Jiang Liu         2015-04-13  1260  

---
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