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.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/wireless/intel/iwlwifi/mvm/fw.c"
],
"versions": [
{
"version": "8ca151b568b6",
"lessThan": "7c8faa310803",
"status": "affected",
"versionType": "git"
},
{
"version": "8ca151b568b6",
"lessThan": "6b3223449c95",
"status": "affected",
"versionType": "git"
},
{
"version": "8ca151b568b6",
"lessThan": "f06cdd8d4ba5",
"status": "affected",
"versionType": "git"
},
{
"version": "8ca151b568b6",
"lessThan": "8ba438ef3cac",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/wireless/intel/iwlwifi/mvm/fw.c"
],
"versions": [
{
"version": "3.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.9",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.135",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.57",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.5.7",
"lessThanOrEqual": "6.5.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]