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wifi: iwlwifi: mvm: don't trust firmware n_channels

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[ Upstream commit 682b6dc29d98e857e6ca4bbc077c7dc2899b7473 ]

If the firmware sends us a corrupted MCC response with
n_channels much larger than the command response can be,
we might copy far too much (uninitialized) memory and
even crash if the n_channels is large enough to make it
run out of the one page allocated for the FW response.

Fix that by checking the lengths. Doing a < comparison
would be sufficient, but the firmware should be doing
it correctly, so check more strictly.

Fixes: dcaf9f5ecb6f ("iwlwifi: mvm: add MCC update FW API")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230514120631.d7b233139eb4.I51fd319df8e9d41881fc8450e83d78049518a79a@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johannes Berg 2023-05-14 12:15:53 +03:00 committed by Greg Kroah-Hartman
parent f9337a4177
commit d0d39bed9e
1 changed files with 10 additions and 0 deletions
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10
drivers/net/wireless/intel/iwlwifi/mvm/nvm.c
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@ -502,6 +502,11 @@ iwl_mvm_update_mcc(struct iwl_mvm *mvm, const char *alpha2,
struct iwl_mcc_update_resp *mcc_resp = (void *)pkt->data;
n_channels = __le32_to_cpu(mcc_resp->n_channels);
if (iwl_rx_packet_payload_len(pkt) !=
struct_size(mcc_resp, channels, n_channels)) {
resp_cp = ERR_PTR(-EINVAL);
goto exit;
}
resp_len = sizeof(struct iwl_mcc_update_resp) +
n_channels * sizeof(__le32);
resp_cp = kmemdup(mcc_resp, resp_len, GFP_KERNEL);
@ -513,6 +518,11 @@ iwl_mvm_update_mcc(struct iwl_mvm *mvm, const char *alpha2,
struct iwl_mcc_update_resp_v3 *mcc_resp_v3 = (void *)pkt->data;
n_channels = __le32_to_cpu(mcc_resp_v3->n_channels);
if (iwl_rx_packet_payload_len(pkt) !=
struct_size(mcc_resp_v3, channels, n_channels)) {
resp_cp = ERR_PTR(-EINVAL);
goto exit;
}
resp_len = sizeof(struct iwl_mcc_update_resp) +
n_channels * sizeof(__le32);
resp_cp = kzalloc(resp_len, GFP_KERNEL);