CVE-2021-47502

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ASoC: codecs: wcd934x: handle channel mappping list correctly<br /> <br /> Currently each channel is added as list to dai channel list, however<br /> there is danger of adding same channel to multiple dai channel list<br /> which endups corrupting the other list where its already added.<br /> <br /> This patch ensures that the channel is actually free before adding to<br /> the dai channel list and also ensures that the channel is on the list<br /> before deleting it.<br /> <br /> This check was missing previously, and we did not hit this issue as<br /> we were testing very simple usecases with sequence of amixer commands.