wifi: rsi: Do not configure WoWlan in shutdown hook if not enabled

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: wifi: rsi: Do not configure WoWlan in shutdown hook if not enabled In case WoWlan was never configured during the operation of the system, the hw->wiphy->wowlan_config will be NULL. rsi_config_wowlan() checks whether wowlan_config is non-NULL and if it is not, then WARNs about it. The warning is valid, as during normal operation the rsi_config_wowlan() should only ever be called with non-NULL wowlan_config. In shutdown this rsi_config_wowlan() should only ever be called if WoWlan was configured before by the user. Add checks for non-NULL wowlan_config into the shutdown hook. While at it, check whether the wiphy is also non-NULL before accessing wowlan_config . Drop the single-use wowlan_config variable, just inline it into function call.

References

• https://git.kernel.org/stable/c/b2aeb97fd470206e67f7b3b4a3e68212a13f747b
• https://git.kernel.org/stable/c/4391fa180856ff84a2cef4a92694a689eebb855e
• https://git.kernel.org/stable/c/eb205a06908122f50b1dd1baa43f7c8036bfc7dc
• https://git.kernel.org/stable/c/1b51236aa49a0564280bd45c94118cab6d9b0fbd
• https://git.kernel.org/stable/c/b601468539c1d97539097bfc87ad11f1704b7eb7
• https://git.kernel.org/stable/c/b241e260820b68c09586e8a0ae0fc23c0e3215bd