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authorJouni Malinen <jouni@qca.qualcomm.com>2011-09-21 16:13:07 +0300
committerJohn W. Linville <linville@tuxdriver.com>2011-09-21 15:58:24 -0400
commit1b9ca0272ffae212e726380f66777b30a56ed7a5 (patch)
treedd91eefd0ee5fe21ba06816a4a25cc2303603744 /net
parent65d0f19e583e80e42b1c67c166bfc4dfdf6ab693 (diff)
downloadlinux-linaro-precise-1b9ca0272ffae212e726380f66777b30a56ed7a5.tar.gz
cfg80211: Fix validation of AKM suites
Incorrect variable was used in validating the akm_suites array from NL80211_ATTR_AKM_SUITES. In addition, there was no explicit validation of the array length (we only have room for NL80211_MAX_NR_AKM_SUITES). This can result in a buffer write overflow for stack variables with arbitrary data from user space. The nl80211 commands using the affected functionality require GENL_ADMIN_PERM, so this is only exposed to admin users. Cc: stable@kernel.org Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/wireless/nl80211.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index e83e7fee3bc..ea40d540a99 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4113,9 +4113,12 @@ static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev,
if (len % sizeof(u32))
return -EINVAL;
+ if (settings->n_akm_suites > NL80211_MAX_NR_AKM_SUITES)
+ return -EINVAL;
+
memcpy(settings->akm_suites, data, len);
- for (i = 0; i < settings->n_ciphers_pairwise; i++)
+ for (i = 0; i < settings->n_akm_suites; i++)
if (!nl80211_valid_akm_suite(settings->akm_suites[i]))
return -EINVAL;
}