From: Guenter Roeck <linux@xxxxxxxxxxxx> [ Upstream commit 1c6b30060777352e7881383bab726046d8c3c610 ] Calls to thermal_zone_get_temp() are not protected against thermal zone device removal. As result, it is possible that the thermal zone operations callbacks are no longer valid when thermal_zone_get_temp() is called. This may result in crashes such as BUG: unable to handle page fault for address: ffffffffc04ef420 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 5d60e067 P4D 5d60e067 PUD 5d610067 PMD 110197067 PTE 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 3209 Comm: cat Tainted: G W 5.10.136-19389-g615abc6eb807 #1 02df41ac0b12f3a64f4b34245188d8875bb3bce1 Hardware name: Google Coral/Coral, BIOS Google_Coral.10068.92.0 11/27/2018 RIP: 0010:thermal_zone_get_temp+0x26/0x73 Code: 89 c3 eb d3 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 53 48 85 ff 74 50 48 89 fb 48 81 ff 00 f0 ff ff 77 44 48 8b 83 98 03 00 00 <48> 83 78 10 00 74 36 49 89 f6 4c 8d bb d8 03 00 00 4c 89 ff e8 9f RSP: 0018:ffffb3758138fd38 EFLAGS: 00010287 RAX: ffffffffc04ef410 RBX: ffff98f14d7fb000 RCX: 0000000000000000 RDX: ffff98f17cf90000 RSI: ffffb3758138fd64 RDI: ffff98f14d7fb000 RBP: ffffb3758138fd50 R08: 0000000000001000 R09: ffff98f17cf90000 R10: 0000000000000000 R11: ffffffff8dacad28 R12: 0000000000001000 R13: ffff98f1793a7d80 R14: ffff98f143231708 R15: ffff98f14d7fb018 FS: 00007ec166097800(0000) GS:ffff98f1bbd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffc04ef420 CR3: 000000010ee9a000 CR4: 00000000003506e0 Call Trace: temp_show+0x31/0x68 dev_attr_show+0x1d/0x4f sysfs_kf_seq_show+0x92/0x107 seq_read_iter+0xf5/0x3f2 vfs_read+0x205/0x379 __x64_sys_read+0x7c/0xe2 do_syscall_64+0x43/0x55 entry_SYSCALL_64_after_hwframe+0x61/0xc6 if a thermal device is removed while accesses to its device attributes are ongoing. The problem is exposed by code in iwl_op_mode_mvm_start(), which registers a thermal zone device only to unregister it shortly afterwards if an unrelated failure is encountered while accessing the hardware. Check if the thermal zone device is registered after acquiring the thermal zone device mutex to ensure this does not happen. The code was tested by triggering the failure in iwl_op_mode_mvm_start() on purpose. Without this patch, the kernel crashes reliably. The crash is no longer observed after applying this and the preceding patches. Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/thermal/thermal_helpers.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/thermal/thermal_helpers.c b/drivers/thermal/thermal_helpers.c index c65cdce8f856..fca0b23570f9 100644 --- a/drivers/thermal/thermal_helpers.c +++ b/drivers/thermal/thermal_helpers.c @@ -115,7 +115,12 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp) int ret; mutex_lock(&tz->lock); - ret = __thermal_zone_get_temp(tz, temp); + + if (device_is_registered(&tz->device)) + ret = __thermal_zone_get_temp(tz, temp); + else + ret = -ENODEV; + mutex_unlock(&tz->lock); return ret; -- 2.35.1
