This is a note to let you know that I've just added the patch titled ASoC: topology: disable size checks for bytes_ext controls if needed to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: asoc-topology-disable-size-checks-for-bytes_ext-cont.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit c1fdacabc06c11f13bdfe47ac07129fbabdfd2e9 Author: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> Date: Thu Sep 17 13:39:12 2020 +0300 ASoC: topology: disable size checks for bytes_ext controls if needed [ Upstream commit 6788fc1a66a0c1d1cec7a0f84f94b517eae8611c ] When CONFIG_SND_CTL_VALIDATION is set, accesses to extended bytes control generate spurious error messages when the size exceeds 512 bytes, such as [ 11.224223] sof_sdw sof_sdw: control 2:0:0:EQIIR5.0 eqiir_coef_5:0: invalid count 1024 In addition the error check returns -EINVAL which has the nasty side effect of preventing applications accessing controls from working, e.g. root@plb:~# alsamixer cannot load mixer controls: Invalid argument It's agreed that the control interface has been abused since 2014, but forcing a check should not prevent existing solutions from working. This patch skips the checks conditionally if CONFIG_SND_CTL_VALIDATION is set and the byte array provided by topology is > 512. This preserves the checks for all other cases. Fixes: 1a3232d2f61d2 ('ASoC: topology: Add support for TLV bytes controls') BugLink: https://github.com/thesofproject/linux/issues/2430 Reported-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx> Reviewed-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx> Reviewed-by: Jaska Uimonen <jaska.uimonen@xxxxxxxxx> Signed-off-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200917103912.2565907-1-kai.vehmanen@xxxxxxxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c index 50aa45525be5a..174d923b5801d 100644 --- a/sound/soc/soc-topology.c +++ b/sound/soc/soc-topology.c @@ -613,6 +613,17 @@ static int soc_tplg_kcontrol_bind_io(struct snd_soc_tplg_ctl_hdr *hdr, k->info = snd_soc_bytes_info_ext; k->tlv.c = snd_soc_bytes_tlv_callback; + /* + * When a topology-based implementation abuses the + * control interface and uses bytes_ext controls of + * more than 512 bytes, we need to disable the size + * checks, otherwise accesses to such controls will + * return an -EINVAL error and prevent the card from + * being configured. + */ + if (IS_ENABLED(CONFIG_SND_CTL_VALIDATION) && sbe->max > 512) + k->access |= SNDRV_CTL_ELEM_ACCESS_SKIP_CHECK; + ext_ops = tplg->bytes_ext_ops; num_ops = tplg->bytes_ext_ops_count; for (i = 0; i < num_ops; i++) {