Gaosheng Cui
e83b47580a
lib/fonts: fix undefined behavior in bit shift for get_default_font
...
[ Upstream commit 6fe888c4d2fb174408e4540bb2d5602b9f507f90 ]
Shifting signed 32-bit value by 31 bits is undefined, so changing
significant bit to unsigned. The UBSAN warning calltrace like below:
UBSAN: shift-out-of-bounds in lib/fonts/fonts.c:139:20
left shift of 1 by 31 places cannot be represented in type 'int'
<TASK>
dump_stack_lvl+0x7d/0xa5
dump_stack+0x15/0x1b
ubsan_epilogue+0xe/0x4e
__ubsan_handle_shift_out_of_bounds+0x1e7/0x20c
get_default_font+0x1c7/0x1f0
fbcon_startup+0x347/0x3a0
do_take_over_console+0xce/0x270
do_fbcon_takeover+0xa1/0x170
do_fb_registered+0x2a8/0x340
fbcon_fb_registered+0x47/0xe0
register_framebuffer+0x294/0x4a0
__drm_fb_helper_initial_config_and_unlock+0x43c/0x880 [drm_kms_helper]
drm_fb_helper_initial_config+0x52/0x80 [drm_kms_helper]
drm_fbdev_client_hotplug+0x156/0x1b0 [drm_kms_helper]
drm_fbdev_generic_setup+0xfc/0x290 [drm_kms_helper]
bochs_pci_probe+0x6ca/0x772 [bochs]
local_pci_probe+0x4d/0xb0
pci_device_probe+0x119/0x320
really_probe+0x181/0x550
__driver_probe_device+0xc6/0x220
driver_probe_device+0x32/0x100
__driver_attach+0x195/0x200
bus_for_each_dev+0xbb/0x120
driver_attach+0x27/0x30
bus_add_driver+0x22e/0x2f0
driver_register+0xa9/0x190
__pci_register_driver+0x90/0xa0
bochs_pci_driver_init+0x52/0x1000 [bochs]
do_one_initcall+0x76/0x430
do_init_module+0x61/0x28a
load_module+0x1f82/0x2e50
__do_sys_finit_module+0xf8/0x190
__x64_sys_finit_module+0x23/0x30
do_syscall_64+0x58/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
</TASK>
Link: https://lkml.kernel.org/r/20221031113829.4183153-1-cuigaosheng1@huawei.com
Fixes: c81f717cb9e0 ("fbcon: Fix typo and bogus logic in get_default_font")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-12-31 13:14:02 +01:00
..
2020-08-10 01:32:59 +09:00
2022-09-05 10:30:03 +02:00
2022-05-18 10:26:49 +02:00
2022-12-31 13:14:02 +01:00
2022-06-09 10:22:53 +02:00
2022-08-17 14:24:03 +02:00
2022-04-13 20:59:21 +02:00
2020-12-15 22:46:19 -08:00
2021-09-08 11:50:26 -07:00
2022-01-27 11:03:58 +01:00
2021-07-08 11:48:20 -07:00
2022-04-08 14:23:56 +02:00
2021-07-08 11:48:20 -07:00
2022-12-02 17:41:08 +01:00
2021-11-18 19:16:17 +01:00
2020-08-10 01:32:59 +09:00
2020-12-29 15:36:49 -08:00
2021-09-24 16:13:35 -07:00
2021-07-01 11:06:05 -07:00
2021-05-02 00:43:35 +09:00
2018-06-12 16:19:22 -07:00
2019-05-24 17:39:02 +02:00
2019-05-24 17:39:02 +02:00
2020-11-18 14:15:17 -06:00
2021-07-08 11:48:20 -07:00
2022-06-06 08:43:37 +02:00
2019-05-30 11:26:32 -07:00
2021-05-26 13:20:50 +02:00
2021-05-06 19:24:12 -07:00
2020-10-16 13:25:14 -06:00
2021-08-13 10:27:50 +02:00
2019-05-21 10:50:45 +02:00
2021-09-14 13:23:22 -07:00
2020-06-11 15:14:53 +02:00
2019-06-05 17:37:16 +02:00
2018-08-16 12:14:42 -07:00
2021-04-01 09:54:37 +01:00
2019-05-24 17:27:11 +02:00
2021-07-08 11:48:22 -07:00
2018-11-30 07:22:05 +01:00
2020-08-20 15:45:14 -04:00
2019-06-19 17:09:55 +02:00
2021-06-23 16:41:41 -06:00
2021-05-05 16:07:40 +02:00
2019-05-24 17:39:02 +02:00
2019-10-18 15:01:57 +02:00
2021-02-05 23:28:29 +01:00
2019-06-19 17:09:06 +02:00
2021-01-21 14:06:00 -07:00
2021-05-06 19:24:12 -07:00
2019-06-19 17:09:06 +02:00
2020-10-16 11:11:20 -07:00
2018-07-27 19:04:33 +08:00
2020-11-02 12:14:19 -08:00
2021-06-05 08:58:12 -07:00
2019-06-19 17:09:06 +02:00
2019-06-19 17:09:06 +02:00
2020-06-18 17:26:43 +10:00
2021-08-19 09:02:55 +09:00
2021-06-22 13:56:43 +02:00
2022-12-31 13:14:01 +01:00
2018-06-12 23:33:24 +02:00
2021-07-01 11:06:05 -07:00
2020-01-31 10:30:40 -08:00
2021-07-01 11:06:06 -07:00
2021-05-06 19:24:12 -07:00
2021-07-01 11:06:06 -07:00
2021-11-18 19:16:17 +01:00
2021-07-01 11:06:05 -07:00
2020-07-31 11:49:08 +02:00
2021-08-13 14:09:32 -10:00
2021-07-08 11:48:20 -07:00
2020-11-20 14:45:33 +11:00
2021-09-08 11:50:26 -07:00
2022-10-26 12:35:08 +02:00
2020-10-16 11:11:20 -07:00
2021-04-16 16:10:37 -07:00
2020-12-15 22:46:15 -08:00
2020-12-15 22:46:19 -08:00
2020-12-15 22:46:15 -08:00
2021-01-03 20:05:18 -05:00
2020-10-16 11:11:22 -07:00
2020-04-15 21:36:41 +01:00
2020-01-08 16:59:19 +00:00
2019-06-05 17:36:38 +02:00
2021-05-06 19:24:12 -07:00
2020-06-04 19:06:25 -07:00
2018-07-27 19:04:33 +08:00
2018-12-29 11:36:44 -08:00
2021-05-06 19:24:12 -07:00
2019-10-14 15:04:00 -07:00
2020-11-18 14:15:17 -06:00
2022-05-09 09:14:30 +02:00
2019-05-13 11:07:33 +02:00
2022-07-12 16:35:18 +02:00
2019-05-21 10:50:45 +02:00
2019-05-21 10:50:45 +02:00
2019-06-19 17:09:56 +02:00
2020-08-14 19:56:57 -07:00
2018-05-09 06:55:44 +02:00
2022-08-17 14:22:51 +02:00
2019-02-19 20:52:19 -07:00
2019-05-30 11:26:32 -07:00
2019-05-24 17:27:11 +02:00
2021-08-19 09:02:55 +09:00
2022-06-22 14:22:03 +02:00
2022-12-08 11:28:44 +01:00
2021-09-24 16:13:34 -07:00
2021-07-20 13:49:44 -07:00
2021-11-12 15:05:49 +01:00
2020-09-28 12:14:08 +01:00
2022-04-13 20:59:27 +02:00
2021-07-08 11:48:20 -07:00
2019-06-19 17:09:08 +02:00
2021-04-10 11:09:41 +02:00
2020-09-07 11:24:17 +02:00
2021-07-02 12:08:10 -07:00
2021-05-19 15:05:11 +02:00
2020-10-16 11:11:19 -07:00
2021-08-13 18:37:38 +02:00
2022-08-25 11:40:40 +02:00
2021-07-08 11:48:20 -07:00
2022-06-09 10:23:31 +02:00
2019-06-05 17:37:06 +02:00
2021-06-22 16:42:08 +02:00
2019-06-07 13:15:06 -07:00
2022-04-13 20:58:59 +02:00
2021-02-17 17:31:06 -06:00
2021-04-16 16:10:37 -07:00
2019-05-24 17:39:02 +02:00
2022-06-22 14:22:03 +02:00
2018-10-16 13:45:44 +02:00
2022-06-22 14:22:03 +02:00
2019-05-21 10:50:45 +02:00
2020-09-26 10:33:57 -07:00
2019-05-24 17:39:02 +02:00
2019-05-21 10:50:45 +02:00
2021-07-08 11:48:20 -07:00
2021-11-25 09:48:45 +01:00
2022-06-14 18:36:24 +02:00
2019-07-03 16:57:18 +02:00
2020-02-16 18:33:00 -08:00
2019-05-21 10:50:45 +02:00
2021-07-08 11:48:20 -07:00
2022-10-26 12:34:49 +02:00
2021-09-17 13:52:17 +01:00
2021-04-16 16:10:37 -07:00
2021-07-01 11:06:05 -07:00
2021-09-19 17:13:35 -07:00
2021-05-06 19:24:12 -07:00
2019-05-21 10:50:45 +02:00
2022-06-06 08:43:36 +02:00
2019-05-21 11:28:45 +02:00
2019-05-21 10:50:45 +02:00
2021-04-16 16:10:37 -07:00
2022-05-30 09:29:10 +02:00
2022-08-31 17:16:43 +02:00
2019-09-25 17:51:39 -07:00
2020-08-12 10:58:00 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-09-03 10:08:28 -07:00
2021-07-08 11:48:20 -07:00
2021-08-24 19:52:40 -03:00
2019-08-08 07:45:01 -06:00
2022-05-30 09:28:59 +02:00
2019-09-24 15:54:09 -07:00
2022-05-30 09:29:15 +02:00
2021-06-29 10:53:46 -07:00
2022-08-17 14:24:08 +02:00
2021-07-08 11:48:20 -07:00
2022-04-13 20:59:28 +02:00
2019-05-30 11:26:32 -07:00
2021-11-21 13:44:12 +01:00
2021-08-30 07:50:56 -07:00
2020-11-19 11:56:16 -08:00
2020-05-01 12:35:21 +10:00
2021-06-18 11:43:09 +02:00
2021-08-13 10:27:49 +02:00
2021-07-08 11:48:20 -07:00
2020-08-12 10:58:00 -07:00
2019-07-01 19:34:46 -07:00
2022-08-17 14:23:23 +02:00
2019-05-21 10:50:45 +02:00
2021-05-13 16:14:45 +02:00
2021-01-18 11:03:26 +01:00
2020-12-15 22:46:16 -08:00
2019-05-21 10:50:45 +02:00
2018-11-30 12:13:15 -08:00
2021-07-01 11:06:03 -07:00
2022-08-17 14:23:43 +02:00
2018-10-15 16:31:29 -04:00
2021-09-03 09:58:15 -07:00
2022-08-17 14:23:05 +02:00
2022-04-08 14:23:54 +02:00
2020-05-08 18:18:12 +01:00
2021-06-25 11:31:03 -06:00
2022-04-08 14:24:01 +02:00
2018-10-16 13:45:44 +02:00
2022-01-27 11:05:44 +01:00
2020-03-06 11:56:59 +01:00
2019-05-21 10:50:45 +02:00
2020-06-15 13:32:11 -07:00
2019-07-16 19:23:22 -07:00
2021-09-08 12:55:35 -07:00
2021-03-24 15:16:09 -07:00
2021-09-06 11:04:03 -07:00
2021-09-08 11:50:26 -07:00
2021-08-22 00:21:36 -07:00
2019-06-05 17:36:37 +02:00
2019-06-05 17:36:37 +02:00
2021-07-01 11:06:05 -07:00
2019-04-08 16:44:21 -06:00
2020-10-16 11:11:20 -07:00
2022-04-13 20:59:27 +02:00
2019-10-16 14:56:21 +02:00
2021-09-03 09:58:14 -07:00
2022-04-08 14:24:09 +02:00
2021-07-19 11:39:28 +02:00
2019-10-03 12:12:23 -04:00
2021-02-17 14:08:01 +01:00
2020-08-12 10:58:00 -07:00
2020-11-18 14:15:17 -06:00
2020-04-07 10:43:43 -07:00
2021-08-13 13:19:06 -06:00
2021-02-05 11:03:47 -08:00
2019-05-24 17:39:02 +02:00
2018-06-07 17:34:39 -07:00
2020-10-16 11:11:22 -07:00
2020-03-23 17:01:47 +01:00
2022-05-30 09:29:10 +02:00
2022-04-08 14:24:09 +02:00
2020-08-12 10:58:00 -07:00