| Message ID | f1f6583bda918f78556f67d522ca7b3b91cebbd5.1702251102.git.soyer@irl.hu (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ALSA: hda/tas2781: handle missing EFI calibration data | expand |
On Mon, 11 Dec 2023 00:37:33 +0100, Gergo Koteles wrote: > > The code does not properly check whether the calibration variable is > available in the EFI. If it is not available, it causes a NULL pointer > dereference. > > Check the return value of the first get_variable call also. > > BUG: kernel NULL pointer dereference, address: 0000000000000000 > Call Trace: > <TASK> > ? __die+0x23/0x70 > ? page_fault_oops+0x171/0x4e0 > ? srso_alias_return_thunk+0x5/0x7f > ? schedule+0x5e/0xd0 > ? exc_page_fault+0x7f/0x180 > ? asm_exc_page_fault+0x26/0x30 > ? crc32_body+0x2c/0x120 > ? tas2781_save_calibration+0xe4/0x220 [snd_hda_scodec_tas2781_i2c] > tasdev_fw_ready+0x1af/0x280 [snd_hda_scodec_tas2781_i2c] > request_firmware_work_func+0x59/0xa0 > > Fixes: 5be27f1e3ec9 ("ALSA: hda/tas2781: Add tas2781 HDA driver") > CC: stable@vger.kernel.org > Signed-off-by: Gergo Koteles <soyer@irl.hu> Thanks, applied now. Takashi
diff --git a/sound/pci/hda/tas2781_hda_i2c.c b/sound/pci/hda/tas2781_hda_i2c.c index fb802802939e..6e506efe61cd 100644 --- a/sound/pci/hda/tas2781_hda_i2c.c +++ b/sound/pci/hda/tas2781_hda_i2c.c @@ -455,9 +455,9 @@ static int tas2781_save_calibration(struct tasdevice_priv *tas_priv) status = efi.get_variable(efi_name, &efi_guid, &attr, &tas_priv->cali_data.total_sz, tas_priv->cali_data.data); - if (status != EFI_SUCCESS) - return -EINVAL; } + if (status != EFI_SUCCESS) + return -EINVAL; tmp_val = (unsigned int *)tas_priv->cali_data.data;
The code does not properly check whether the calibration variable is available in the EFI. If it is not available, it causes a NULL pointer dereference. Check the return value of the first get_variable call also. BUG: kernel NULL pointer dereference, address: 0000000000000000 Call Trace: <TASK> ? __die+0x23/0x70 ? page_fault_oops+0x171/0x4e0 ? srso_alias_return_thunk+0x5/0x7f ? schedule+0x5e/0xd0 ? exc_page_fault+0x7f/0x180 ? asm_exc_page_fault+0x26/0x30 ? crc32_body+0x2c/0x120 ? tas2781_save_calibration+0xe4/0x220 [snd_hda_scodec_tas2781_i2c] tasdev_fw_ready+0x1af/0x280 [snd_hda_scodec_tas2781_i2c] request_firmware_work_func+0x59/0xa0 Fixes: 5be27f1e3ec9 ("ALSA: hda/tas2781: Add tas2781 HDA driver") CC: stable@vger.kernel.org Signed-off-by: Gergo Koteles <soyer@irl.hu> --- sound/pci/hda/tas2781_hda_i2c.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa