kernel: wifi: nl80211: don't free NULL coalescing rule

A possible NULL pointer dereference was observed in the Linux kernel, in net/wireless/nl80211.c. This may lead to a crash...

CVE-2023-52832

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: don't return unset power in ieee80211gettxpower We can get a UBSAN warning if ieee80211gettxpower returns the INTMIN value mac80211 internally uses for "unset power level". UBSAN: signed-integer-overflow in...