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cfg80211: validate key index better

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Don't accept it if a key_idx < 0 snuck through, reject WEP keys with
key index 4 and 5 (which are used for IGTKs) and don't allow IGTKs
with key indices other than 4 and 5. This makes the key data match
expectations better.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2016-09-13 16:37:40 +02:00
parent 9381e267b6
commit e9c8f8d3a4
1 changed files with 7 additions and 1 deletions
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8
net/wireless/util.c
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@ -218,7 +218,7 @@ int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
struct key_params *params, int key_idx,
bool pairwise, const u8 *mac_addr)
{
if (key_idx > 5)
if (key_idx < 0 || key_idx > 5)
return -EINVAL;
if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
@ -249,7 +249,13 @@ int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
/* Disallow BIP (group-only) cipher as pairwise cipher */
if (pairwise)
return -EINVAL;
if (key_idx < 4)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
if (key_idx > 3)
return -EINVAL;
default:
break;
}