UBUNTU-CVE-2023-52531

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UBUNTU-CVE-2023-52531

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2023-52531, https://git.kernel.org/linus/8ba438ef3cacc4808a63ed0ce24d4f0942cfe55d, https://www.cve.org/CVERecord?id=CVE-2023-52531, https://ubuntu.com/security/notices/USN-7088-1, https://ubuntu.com/security/notices/USN-7088-2, https://ubuntu.com/security/notices/USN-7088-3, https://ubuntu.com/security/notices/USN-7088-4, https://ubuntu.com/security/notices/USN-7088-5, https://ubuntu.com/security/notices/USN-7121-1, https://ubuntu.com/security/notices/USN-7119-1, https://ubuntu.com/security/notices/USN-7121-2, https://ubuntu.com/security/notices/USN-7121-3, https://ubuntu.com/security/notices/USN-7148-1