Hello,
kernel test robot noticed "KASAN:null-ptr-deref_in_range[#-#]" on:
commit: bfd3d4a40f3905ec70b17dbfa9b78764e59e4b4f ("serial: 8250_dw: Drop unneeded NULL checks in dw8250_quirks()")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
in testcase: kernel-selftests
version: kernel-selftests-x86_64-7503345ac5f5-1_20241208
with following parameters:
group: sgx
config: x86_64-rhel-9.4-kselftests
compiler: gcc-12
test machine: 16 threads 1 sockets Intel(R) Xeon(R) E-2278G CPU @ 3.40GHz (Coffee Lake-E) with 32G memory
(please refer to attached dmesg/kmsg for entire log/backtrace)
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 <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202502121529.f7e65d49-lkp@xxxxxxxxx
[ 34.377423][ T125] iTCO_wdt iTCO_wdt: unable to reset NO_REBOOT flag, device disabled by hardware/BIOS
[ 34.392689][ T357] IOAPIC[0]: Preconfigured routing entry (2-17 -> IRQ 17 Level:1 ActiveLow:1)
Mountin[ 34.427657][ T357] idma64 idma64.1: Found Intel integrated DMA 64-bit
[ 34.431964][ T346] ppdev: user-space parallel port driver
[ 34.457700][ T357] idma64 idma64.2: Found Intel integrated DMA 64-bit
[ 34.481800][ T357] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[ 34.490095][ T357] CPU: 6 UID: 0 PID: 357 Comm: (udev-worker) Not tainted 6.14.0-rc1-00009-gbfd3d4a40f39 #1
[ 34.499959][ T357] Hardware name: Intel Corporation Mehlow UP Server Platform/Moss Beach Server, BIOS CNLSE2R1.R00.X188.B13.1903250419 03/25/2019
[ 34.501967][ T125] i2c i2c-0: Successfully instantiated SPD at 0x51
[ 34.513099][ T357] RIP: 0010:dw8250_probe (kbuild/src/consumer/drivers/tty/serial/8250/8250_dw.c:462 kbuild/src/consumer/drivers/tty/serial/8250/8250_dw.c:629)
[ 34.521181][ T125] i2c i2c-0: Successfully instantiated SPD at 0x53
[ 34.524691][ T357] Code: c1 ea 03 80 3c 02 00 0f 85 21 07 00 00 49 8b 8c 24 30 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 79 08 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 07
All code
========
0: c1 ea 03 shr $0x3,%edx
3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
7: 0f 85 21 07 00 00 jne 0x72e
d: 49 8b 8c 24 30 01 00 mov 0x130(%r12),%rcx
14: 00
15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1c: fc ff df
1f: 48 8d 79 08 lea 0x8(%rcx),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
2a:* 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 03 add $0x3,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 07 test %eax,(%rdi)
Code starting with the faulting instruction
===========================================
0: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx
4: 48 89 f8 mov %rdi,%rax
7: 83 e0 07 and $0x7,%eax
a: 83 c0 03 add $0x3,%eax
d: 38 d0 cmp %dl,%al
f: 7c 08 jl 0x19
11: 84 d2 test %dl,%dl
13: 0f .byte 0xf
14: 85 07 test %eax,(%rdi)
[ 34.524695][ T357] RSP: 0018:ffffc9000224e858 EFLAGS: 00010202
[ 34.524700][ T357] RAX: dffffc0000000000 RBX: 1ffff92000449d12 RCX: 0000000000000000
[ 34.564397][ T357] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000008
[ 34.572267][ T357] RBP: ffff888107cff010 R08: 0000000000000001 R09: 0000000000000001
[ 34.580138][ T357] R10: ffffffff86469427 R11: ffffffff81e3d5bb R12: ffff8881db096428
[ 34.588001][ T357] R13: ffffc9000224e8b0 R14: ffff8881db096558 R15: 0000000000000000
[ 34.595864][ T357] FS: 00007f2e783558c0(0000) GS:ffff8887d8300000(0000) knlGS:0000000000000000
[ 34.604683][ T357] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 34.611161][ T357] CR2: 00007f2e78141e81 CR3: 00000002105a8005 CR4: 00000000003706f0
[ 34.619049][ T357] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 34.626896][ T357] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 34.634759][ T357] Call Trace:
[ 34.637933][ T357] <TASK>
[ 34.640824][ T357] ? die_addr (kbuild/src/consumer/arch/x86/kernel/dumpstack.c:421 kbuild/src/consumer/arch/x86/kernel/dumpstack.c:460)
[ 34.644877][ T357] ? exc_general_protection (kbuild/src/consumer/arch/x86/kernel/traps.c:751 kbuild/src/consumer/arch/x86/kernel/traps.c:693)
[ 34.650318][ T357] ? asm_exc_general_protection (kbuild/src/consumer/arch/x86/include/asm/idtentry.h:574)
[ 34.655938][ T357] ? __kasan_kmalloc (kbuild/src/consumer/mm/kasan/common.c:377 kbuild/src/consumer/mm/kasan/common.c:394)
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250212/202502121529.f7e65d49-lkp@xxxxxxxxx
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
