CVE-2025-37889
ASoC: ops: Consistently treat platform_max as control value
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ASoC: ops: Consistently treat platform_max as control value
In the Linux kernel, the following vulnerability has been resolved: ASoC: ops: Consistently treat platform_max as control value This reverts commit 9bdd10d57a88 ("ASoC: ops: Shift tested values in snd_soc_put_volsw() by +min"), and makes some additional related updates. There are two ways the platform_max could be interpreted; the maximum register value, or the maximum value the control can be set to. The patch moved from treating the value as a control value to a register one. When the patch was applied it was technically correct as snd_soc_limit_volume() also used the register interpretation. However, even then most of the other usages treated platform_max as a control value, and snd_soc_limit_volume() has since been updated to also do so in commit fb9ad24485087 ("ASoC: ops: add correct range check for limiting volume"). That patch however, missed updating snd_soc_put_volsw() back to the control interpretation, and fixing snd_soc_info_volsw_range(). The control interpretation makes more sense as limiting is typically done from the machine driver, so it is appropriate to use the customer facing representation rather than the internal codec representation. Update all the code to consistently use this interpretation of platform_max. Finally, also add some comments to the soc_mixer_control struct to hopefully avoid further patches switching between the two approaches.
Reserved 2025-04-16 | Published 2025-05-09 | Updated 2025-05-10 | Assigner Linuxgit.kernel.org/...c/c402f184a053c8e7ca325e50f04bbbc1e4fee019
git.kernel.org/...c/694110bc2407a61f02a770cbb5f39b51e4ec77c6
git.kernel.org/...c/544055329560d4b64fe204fc6be325ebc24c72ca
git.kernel.org/...c/a46a9371f8b9a0eeff53a21e11ed3b65f52d9cf6
git.kernel.org/...c/296c8295ae34045da0214882628d49c1c060dd8a
git.kernel.org/...c/0eba2a7e858907a746ba69cd002eb9eb4dbd7bf3
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