6.6-stable review patch. If anyone has any objections, please let me know.
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From: Gergo Koteles soyer@irl.hu
commit 33071422714a4c9587753b0ccc130ca59323bf42 upstream.
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 Link: https://lore.kernel.org/r/f1f6583bda918f78556f67d522ca7b3b91cebbd5.170225110... Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/pci/hda/tas2781_hda_i2c.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- 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(stru 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;