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authorSrinivas Dasari <dasaris@qti.qualcomm.com>2017-07-07 01:43:42 +0300
committerJohannes Berg <johannes.berg@intel.com>2017-07-07 11:24:31 +0200
commitd7f13f7450369281a5d0ea463cc69890a15923ae (patch)
tree6dc8749c061563fb004e70f65bb3cb179ac18e9e /net/wireless
parent8feb69c7bd89513be80eb19198d48f154b254021 (diff)
cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES
validate_scan_freqs() retrieves frequencies from attributes nested in the attribute NL80211_ATTR_SCAN_FREQUENCIES with nla_get_u32(), which reads 4 bytes from each attribute without validating the size of data received. Attributes nested in NL80211_ATTR_SCAN_FREQUENCIES don't have an nla policy. Validate size of each attribute before parsing to avoid potential buffer overread. Fixes: 2a519311926 ("cfg80211/nl80211: scanning (and mac80211 update to use it)") Cc: stable@vger.kernel.org Signed-off-by: Srinivas Dasari <dasaris@qti.qualcomm.com> Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
-rw-r--r--net/wireless/nl80211.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 59f1ea5a83ef..571aed1e6f36 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6469,6 +6469,10 @@ static int validate_scan_freqs(struct nlattr *freqs)
struct nlattr *attr1, *attr2;
int n_channels = 0, tmp1, tmp2;
+ nla_for_each_nested(attr1, freqs, tmp1)
+ if (nla_len(attr1) != sizeof(u32))
+ return 0;
+
nla_for_each_nested(attr1, freqs, tmp1) {
n_channels++;
/*