Patch "cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES" has been added to the 4.9-stable tree

Patch "cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cfg80211-validate-frequencies-nested-in-nl80211_attr_scan_frequencies.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d7f13f7450369281a5d0ea463cc69890a15923ae Mon Sep 17 00:00:00 2001
From: Srinivas Dasari <dasaris@qti.qualcomm.com>
Date: Fri, 7 Jul 2017 01:43:42 +0300
Subject: cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES

From: Srinivas Dasari <dasaris@qti.qualcomm.com>

commit d7f13f7450369281a5d0ea463cc69890a15923ae upstream.

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)")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/wireless/nl80211.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -6327,6 +6327,10 @@ static int validate_scan_freqs(struct nl
 	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++;
 		/*


Patches currently in stable-queue which might be from dasaris@qti.qualcomm.com are

queue-4.9/cfg80211-validate-frequencies-nested-in-nl80211_attr_scan_frequencies.patch
queue-4.9/cfg80211-check-if-pmkid-attribute-is-of-expected-size.patch
queue-4.9/cfg80211-define-nla_policy-for-nl80211_attr_local_mesh_power_mode.patch
queue-4.9/cfg80211-check-if-nan-service-id-is-of-expected-size.patch