soundwire: intel: fix possible crash when no device is detected
acpi_walk_namespace can return success without executing our
callback which initializes info->handle.
If the random value in this structure is a valid address (which
is on the stack, so it's quite possible), then nothing bad will
happen, because:
sdw_intel_scan_controller
-> acpi_bus_get_device
-> acpi_get_device_data
-> acpi_get_data_full
-> acpi_ns_validate_handle
will reject this handle.
However, if the value from the stack doesn't point to a valid
address, we get this:
BUG: kernel NULL pointer dereference, address: 0000000000000050
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 6 PID: 472 Comm: systemd-udevd Tainted: G W 5.10.0-1-amd64 #1 Debian 5.10.4-1
Hardware name: HP HP Pavilion Laptop 15-cs3xxx/86E2, BIOS F.05 01/01/2020
RIP: 0010:acpi_ns_validate_handle+0x1a/0x23
Code: 00 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 44 00 00 48 8d 57 ff 48 89 f8 48 83 fa fd 76 08 48 8b 05 0c b8 67 01 c3 <80> 7f 08 0f 74 02 31 c0 c3 0f 1f 44 00 00 48 8b 3d f6 b7 67 01 e8
RSP: 0000:ffffc388807c7b20 EFLAGS: 00010213
RAX: 0000000000000048 RBX: ffffc388807c7b70 RCX: 0000000000000000
RDX: 0000000000000047 RSI: 0000000000000246 RDI: 0000000000000048
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffc0f5f4d1 R11: ffffffff8f0cb268 R12: 0000000000001001
R13: ffffffff8e33b160 R14: 0000000000000048 R15: 0000000000000000
FS: 00007f24548288c0(0000) GS:ffff9f781fb80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000050 CR3: 0000000106158004 CR4: 0000000000770ee0
PKRU: 55555554
Call Trace:
acpi_get_data_full+0x4d/0x92
acpi_bus_get_device+0x1f/0x40
sdw_intel_acpi_scan+0x59/0x230 [soundwire_intel]
? strstr+0x22/0x60
? dmi_matches+0x76/0xe0
snd_intel_dsp_driver_probe.cold+0xaf/0x163 [snd_intel_dspcfg]
azx_probe+0x7a/0x970 [snd_hda_intel]
local_pci_probe+0x42/0x80
? _cond_resched+0x16/0x40
pci_device_probe+0xfd/0x1b0
really_probe+0x205/0x460
driver_probe_device+0xe1/0x150
device_driver_attach+0xa1/0xb0
__driver_attach+0x8a/0x150
? device_driver_attach+0xb0/0xb0
? device_driver_attach+0xb0/0xb0
bus_for_each_dev+0x78/0xc0
bus_add_driver+0x12b/0x1e0
driver_register+0x8b/0xe0
? 0xffffffffc0f65000
do_one_initcall+0x44/0x1d0
? do_init_module+0x23/0x250
? kmem_cache_alloc_trace+0xf5/0x200
do_init_module+0x5c/0x250
__do_sys_finit_module+0xb1/0x110
do_syscall_64+0x33/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210208120104.204761-1-marcin.slusarz@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
1 file changed