CVE-2023-52531
Vulnerability from cvelistv5
Published
2024-03-02 21:52
Modified
2024-12-19 08:21
Severity ?
Summary
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b3223449c959a8be94a1f042288059e40fcccb0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c8faa31080342aec4903c9acb20caf82fcca1efPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8ba438ef3cacc4808a63ed0ce24d4f0942cfe55dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f06cdd8d4ba5252986f51f80cc30263636397128Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6b3223449c959a8be94a1f042288059e40fcccb0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7c8faa31080342aec4903c9acb20caf82fcca1efPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8ba438ef3cacc4808a63ed0ce24d4f0942cfe55dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f06cdd8d4ba5252986f51f80cc30263636397128Patch
Impacted products
Vendor Product Version
Linux Linux Version: 3.9
Show details on NVD website

To clipboard 

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Al final de esta estructura, se encuentra la matriz flexible de \u0027canales\u0027. Cada elemento es de tipo \u0027struct ieee80211_channel\u0027. Entonces solo se asigna 1 elemento en esta matriz. Al hacer: mvm-\u0026gt;nvm_data-\u0026gt;bands[0].channels = mvm-\u0026gt;nvm_data-\u0026gt;channels; Apuntamos al primer elemento de la matriz flexible \u0027canales\u0027. Entonces esto est\u00e1 bien. Sin embargo, al hacer: mvm-\u0026gt;nvm_data-\u0026gt;bands[0].bitrates = (void *)((u8 *)mvm-\u0026gt;nvm_data-\u0026gt;channels + 1); debido a la conversi\u00f3n \\\"(u8 *)\\\", agregamos solo 1 a la direcci\u00f3n del comienzo de la matriz flexible. Es probable que queramos apuntar a la \u0027estructura ieee80211_rate\u0027 asignada justo despu\u00e9s. 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