Re: [PATCH AUTOSEL 6.9 17/40] ASoC: topology: Fix route memory corruption

[Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>]

On 8/5/24 18:17, Vitaly Chikunov wrote:
> Sasha, Greg,
> 
> On Tue, Jul 09, 2024 at 12:18:57PM GMT, Sasha Levin wrote:
>> From: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
>>
>> [ Upstream commit 0298f51652be47b79780833e0b63194e1231fa34 ]
>>
>> It was reported that recent fix for memory corruption during topology
>> load, causes corruption in other cases. Instead of being overeager with
>> checking topology, assume that it is properly formatted and just
>> duplicate strings.
> 
> Can this backport actually be applied to the 6.9/6.6/6.1 stable branches?
> 
> I have multiple bug reports about sound not working and memory
> corruption on some laptops (for example ICL RAYbook Si1516). See for
> example bug reports[1][2], and the fix discussion [3].
> 
> dmesg messages from Lenovo ThinkBook 13 gen 1:
> 
> 
>   [ 3.555191] sof-audio-pci-intel-cnl 0000:00:1f.3: Firmware info: version 2:2:0-57864
>   [ 3.555206] sof-audio-pci-intel-cnl 0000:00:1f.3: Firmware: ABI 3:22:1 Kernel ABI 3:23:0
>   [ 3.574043] sof-audio-pci-intel-cnl 0000:00:1f.3: Topology: ABI 3:22:1 Kernel ABI 3:23:0
>   [ 3.575180] sof-audio-pci-intel-cnl 0000:00:1f.3: error: sink MIXER1.0> not found
>   [ 3.575772] sof-audio-pci-intel-cnl 0000:00:1f.3: error: tplg component load failed -22
>   [ 3.575793] sof-audio-pci-intel-cnl 0000:00:1f.3: error: failed to load DSP topology -22
>   [ 3.575801] sof-audio-pci-intel-cnl 0000:00:1f.3: ASoC: error at snd_soc_component_probe on 0000:00:1f.3: -22
> 
> Error messages from other boots showing memory corruption:
> 
>   [ 3.904397] sof-audio-pci-intel-cnl 0000:00:1f.3: error: sink PCM0C03-std-def-alt0.p11@jh\x86Ŝ\xff\xff@\xc8\xff\x82Ŝ\xff\xff`P\x82\xbb\xff\xff\xff\xff\x94$A\xbc\xff\xff\xff\xff\x06 not found
>   [ 3.966777] sof-audio-pci-intel-cnl 0000:00:1f.3: error: sink PGA1.0\x01 not found
>   [ 3.899748] sof-audio-pci-intel-cnl 0000:00:1f.3: error: source BUF2.0 not found
>   [ 3.975359] sof-audio-pci-intel-cnl 0000:00:1f.3: error: source PCM0P\x01pcsc-lite.conf not found
>   [ 7.275851] sof-audio-pci-intel-tgl 0000:00:1f.3: error: source HDA1.IN/0123456789:;<=>? not found
> 
> [1] https://github.com/thesofproject/sof/issues/9339
> [2] https://github.com/thesofproject/sof/issues/9341
> [3] https://lore.kernel.org/linux-sound/171812236450.201359.3019210915105428447.b4-ty@xxxxxxxxxx/T/#m8c4bd5abf453960fde6f826c4b7f84881da63e9d

Agree, the commit "ASoC: topology: Fix references to freed memory"
[ Upstream commit 97ab304ecd95c0b1703ff8c8c3956dc6e2afe8e1 ]
should not have landed on any -stable branch. It should be reverted or
this follow-up fix be applied.

> 
> Thanks,
> 
>>
>> Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
>> Closes: https://lore.kernel.org/linux-sound/171812236450.201359.3019210915105428447.b4-ty@xxxxxxxxxx/T/#m8c4bd5abf453960fde6f826c4b7f84881da63e9d
>> Suggested-by: Péter Ujfalusi <peter.ujfalusi@xxxxxxxxxxxxxxx>
>> Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
>> Link: https://lore.kernel.org/r/20240613090126.841189-1-amadeuszx.slawinski@xxxxxxxxxxxxxxx
>> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
>> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
>> ---
>>  sound/soc/soc-topology.c | 12 +++---------
>>  1 file changed, 3 insertions(+), 9 deletions(-)
>>
>> diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
>> index 52752e0a5dc27..27aba69894b17 100644
>> --- a/sound/soc/soc-topology.c
>> +++ b/sound/soc/soc-topology.c
>> @@ -1052,21 +1052,15 @@ static int soc_tplg_dapm_graph_elems_load(struct soc_tplg *tplg,
>>  			break;
>>  		}
>>  
>> -		route->source = devm_kmemdup(tplg->dev, elem->source,
>> -					     min(strlen(elem->source), maxlen),
>> -					     GFP_KERNEL);
>> -		route->sink = devm_kmemdup(tplg->dev, elem->sink,
>> -					   min(strlen(elem->sink), maxlen),
>> -					   GFP_KERNEL);
>> +		route->source = devm_kstrdup(tplg->dev, elem->source, GFP_KERNEL);
>> +		route->sink = devm_kstrdup(tplg->dev, elem->sink, GFP_KERNEL);
>>  		if (!route->source || !route->sink) {
>>  			ret = -ENOMEM;
>>  			break;
>>  		}
>>  
>>  		if (strnlen(elem->control, maxlen) != 0) {
>> -			route->control = devm_kmemdup(tplg->dev, elem->control,
>> -						      min(strlen(elem->control), maxlen),
>> -						      GFP_KERNEL);
>> +			route->control = devm_kstrdup(tplg->dev, elem->control, GFP_KERNEL);
>>  			if (!route->control) {
>>  				ret = -ENOMEM;
>>  				break;
>> -- 
>> 2.43.0
>>