wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix possible out-of-bound write in ath12k_wmi_ext_hal_reg_caps() reg_cap.phy_id is extracted from WMI event and could be an unexpected value in case some errors happen. As a result out-of-bound write may occur to soc->hal_reg_cap. Fix it by validating reg_cap.phy_id before using it. This is found during code review. Compile tested only.

References

• https://git.kernel.org/stable/c/dfe13eaab043130f90dd3d57c7d88577c04adc97
• https://git.kernel.org/stable/c/4dd0547e8b45faf6f95373be5436b66cde326c0e
• https://git.kernel.org/stable/c/b302dce3d9edea5b93d1902a541684a967f3c63c