CVE-2023-52531

In the Linux kernel, the following vulnerability has been resolved: wifi:
iwlwifi: mvm: Fix a memory corruption issue A few lines above, space is
kzalloc()'ed for: sizeof(struct iwl_nvm_data) + sizeof(struct
ieee80211_channel) + sizeof(struct ieee80211_rate) ‘mvm->nvm_data’ is a
‘struct iwl_nvm_data’, so it is fine. At the end of this structure, there
is the ‘channels’ flex array. Each element is of type ‘struct
ieee80211_channel’. So only 1 element is allocated in this array. When
doing: mvm->nvm_data->bands[0].channels = mvm->nvm_data->channels; We point
at the first element of the ‘channels’ flex array. So this is fine.
However, when doing: mvm->nvm_data->bands[0].bitrates = (void *)((u8
*)mvm->nvm_data->channels + 1); because of the “(u8 *)” cast, we add only 1
to the address of the beginning of the flex array. It is likely that we
want point at the ‘struct ieee80211_rate’ allocated just after. Remove the
spurious casting so that the pointer arithmetic works as expected.