[Bug 1949329] Re: [SRU] alsa-lib: ucm: Regex returns correct value without matching a string

[Hui Wang]

** Description changed:

- This bug is for tracking purpose.
+ [Impact]
+ In the Dell project, we tried to enable the audio on a machine, the machine has the soundwire audio design, it needs to load the ucm correctly, then users could see the audio devices from gnome. But on this machine, the ucm can't be loaded, through debugging, we found this machine has no headset, the Regex returns a wrong value when matching "Regex " hs:([a-z0-9]+(-sdca)?)". If let Regex returns a correct value, the ucm could be loaded successfully.
+ 
+ [Fix]
+ Backport a commit from upstream, this commit is merged to upstream from v1.2.5
+ 
+ [Test]
+ After installed the patched libasound2, reboot, we could see the ucm is loaded succesfully on this machine, and open the gnome-sound-setting, we could see the internal mic and internal speaker, and all of them could work normally.
+ 
+ [Where problems will occur]
+ This change affect the Regex parser in the ucm, so if it could introduce regression, it will be on the ucm. It could make the audio not work (fail to load ucm and users can't see any audio devices from gnome) on the machines which need ucm. But this possibility is very low, since this commit is backported from upstream and we already tested this backporting on 2 lenovo machines and 2 Dell machines which all need ucm to work.

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https://bugs.launchpad.net/bugs/1949329

Title:
  [SRU] alsa-lib: ucm: Regex returns correct value without matching a
  string

Status in HWE Next:
  New
Status in alsa-lib package in Ubuntu:
  In Progress
Status in alsa-lib source package in Focal:
  In Progress
Status in alsa-lib source package in Hirsute:
  In Progress
Status in alsa-lib source package in Impish:
  In Progress
Status in alsa-lib source package in Jammy:
  In Progress

Bug description:
  [Impact]
  In the Dell project, we tried to enable the audio on a machine, the machine has the soundwire audio design, it needs to load the ucm correctly, then users could see the audio devices from gnome. But on this machine, the ucm can't be loaded, through debugging, we found this machine has no headset, the Regex returns a wrong value when matching "Regex " hs:([a-z0-9]+(-sdca)?)". If let Regex returns a correct value, the ucm could be loaded successfully.

  [Fix]
  Backport a commit from upstream, this commit is merged to upstream from v1.2.5

  [Test]
  After installed the patched libasound2, reboot, we could see the ucm is loaded succesfully on this machine, and open the gnome-sound-setting, we could see the internal mic and internal speaker, and all of them could work normally.

  [Where problems will occur]
  This change affect the Regex parser in the ucm, so if it could introduce regression, it will be on the ucm. It could make the audio not work (fail to load ucm and users can't see any audio devices from gnome) on the machines which need ucm. But this possibility is very low, since this commit is backported from upstream and we already tested this backporting on 2 lenovo machines and 2 Dell machines which all need ucm to work.

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