diff options
| author | Gergo Koteles <soyer@irl.hu> | 2023-12-11 00:37:33 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-12-11 08:58:18 +0100 |
| commit | 33071422714a4c9587753b0ccc130ca59323bf42 (patch) | |
| tree | cfd80ac2cc676f36e52439fb7dd5c65cf4ef72c1 /sound | |
| parent | 75a25d31b80770485641ad2789a854955f5c1e40 (diff) | |
| download | lwn-33071422714a4c9587753b0ccc130ca59323bf42.tar.gz lwn-33071422714a4c9587753b0ccc130ca59323bf42.zip | |
ALSA: hda/tas2781: handle missing EFI calibration 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>
Link: https://lore.kernel.org/r/f1f6583bda918f78556f67d522ca7b3b91cebbd5.1702251102.git.soyer@irl.hu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/pci/hda/tas2781_hda_i2c.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/pci/hda/tas2781_hda_i2c.c b/sound/pci/hda/tas2781_hda_i2c.c index b42837105c22..d3dafc9d150b 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; |