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mwifiex: Increase AES key storage size to 256 bits 

Following commit e186967865 ("mwifiex: Prevent memory corruption
handling keys") the mwifiex driver fails to authenticate with certain
networks, specifically networks with 256 bit keys, and repeatedly asks
for the password. The kernel log repeats the following lines (id and
bssid redacted):

    mwifiex_pcie 0000:01:00.0: info: trying to associate to '<id>' bssid <bssid>
    mwifiex_pcie 0000:01:00.0: info: associated to bssid <bssid> successfully
    mwifiex_pcie 0000:01:00.0: crypto keys added
    mwifiex_pcie 0000:01:00.0: info: successfully disconnected from <bssid>: reason code 3

Tracking down this problem lead to the overflow check introduced by the
aforementioned commit into mwifiex_ret_802_11_key_material_v2(). This
check fails on networks with 256 bit keys due to the current storage
size for AES keys in struct mwifiex_aes_param being only 128 bit.

To fix this issue, increase the storage size for AES keys to 256 bit.

Fixes: e186967865 ("mwifiex: Prevent memory corruption handling keys")
Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Reported-by: Kaloyan Nikolov <konik98@gmail.com>
Tested-by: Kaloyan Nikolov <konik98@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200825153829.38043-1-luzmaximilian@gmail.com
This commit is contained in:
Maximilian Luz 2020-08-25 17:38:29 +02:00 committed by Kalle Valo
parent b4be5a53eb
commit 4afc850e2e
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/marvell/mwifiex/fw.h
View File

@ -954,7 +954,7 @@ struct mwifiex_tkip_param {
struct mwifiex_aes_param {
u8 pn[WPA_PN_SIZE];
__le16 key_len;
u8 key[WLAN_KEY_LEN_CCMP];
u8 key[WLAN_KEY_LEN_CCMP_256];
} __packed;
struct mwifiex_wapi_param {

4
drivers/net/wireless/marvell/mwifiex/sta_cmdresp.c
View File

@ -619,7 +619,7 @@ static int mwifiex_ret_802_11_key_material_v2(struct mwifiex_private *priv,
key_v2 = &resp->params.key_material_v2;
len = le16_to_cpu(key_v2->key_param_set.key_params.aes.key_len);
if (len > WLAN_KEY_LEN_CCMP)
if (len > sizeof(key_v2->key_param_set.key_params.aes.key))
return -EINVAL;
if (le16_to_cpu(key_v2->action) == HostCmd_ACT_GEN_SET) {
@ -635,7 +635,7 @@ static int mwifiex_ret_802_11_key_material_v2(struct mwifiex_private *priv,
return 0;
memset(priv->aes_key_v2.key_param_set.key_params.aes.key, 0,
WLAN_KEY_LEN_CCMP);
sizeof(key_v2->key_param_set.key_params.aes.key));
priv->aes_key_v2.key_param_set.key_params.aes.key_len =
cpu_to_le16(len);
memcpy(priv->aes_key_v2.key_param_set.key_params.aes.key,