[PATCH] drm/amdkfd: fix shift out of bounds about gpu debug

[Jesse Zhang]

 the issue is :
[  388.151802] UBSAN: shift-out-of-bounds in drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_int_process_v10.c:346:5
[  388.151807] shift exponent 4294967295 is too large for 64-bit type 'long long unsigned int'
[  388.151812] CPU: 6 PID: 347 Comm: kworker/6:1H Tainted: G            E      6.7.0+ #1
[  388.151814] Hardware name: AMD Splinter/Splinter-GNR, BIOS WS54117N_140 01/16/2024
[  388.151816] Workqueue: KFD IH interrupt_wq [amdgpu]
[  388.152084] Call Trace:
[  388.152086]  <TASK>
[  388.152089]  dump_stack_lvl+0x4c/0x70
[  388.152096]  dump_stack+0x14/0x20
[  388.152098]  ubsan_epilogue+0x9/0x40
[  388.152101]  __ubsan_handle_shift_out_of_bounds+0x113/0x170
[  388.152103]  ? vprintk+0x40/0x70
[  388.152106]  ? swsusp_check+0x131/0x190
[  388.152110]  event_interrupt_wq_v10.cold+0x16/0x1e [amdgpu]
[  388.152411]  ? raw_spin_rq_unlock+0x14/0x40
[  388.152415]  ? finish_task_switch+0x85/0x2a0
[  388.152417]  ? kfifo_copy_out+0x5f/0x70
[  388.152420]  interrupt_wq+0xb2/0x120 [amdgpu]
[  388.152642]  ? interrupt_wq+0xb2/0x120 [amdgpu]
[  388.152728]  process_scheduled_works+0x9a/0x3a0
[  388.152731]  ? __pfx_worker_thread+0x10/0x10
[  388.152732]  worker_thread+0x15f/0x2d0
[  388.152733]  ? __pfx_worker_thread+0x10/0x10
[  388.152734]  kthread+0xfb/0x130
[  388.152735]  ? __pfx_kthread+0x10/0x10
[  388.152736]  ret_from_fork+0x3d/0x60
[  388.152738]  ? __pfx_kthread+0x10/0x10
[  388.152739]  ret_from_fork_asm+0x1b/0x30
[  388.152742]  </TASK>

Signed-off-by: Jesse Zhang <Jesse.Zhang at amd.com>
---
 include/uapi/linux/kfd_ioctl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
index 9ce46edc62a5..3d5867df17e8 100644
--- a/include/uapi/linux/kfd_ioctl.h
+++ b/include/uapi/linux/kfd_ioctl.h
@@ -887,7 +887,7 @@ enum kfd_dbg_trap_exception_code {
 };
 
 /* Mask generated by ecode in kfd_dbg_trap_exception_code */
-#define KFD_EC_MASK(ecode)	(1ULL << (ecode - 1))
+#define KFD_EC_MASK(ecode)	(ecode ? (1ULL << (ecode - 1)) : 0ULL)
 
 /* Masks for exception code type checks below */
 #define KFD_EC_MASK_QUEUE	(KFD_EC_MASK(EC_QUEUE_WAVE_ABORT) |	\
-- 
2.25.1