[wireless-regdb] [PATCH 02/40] crda: port over Linux is_valid_reg_rule() change bd05f28e

[Luis R. Rodriguez]

From: "Luis R. Rodriguez" <mcgrof at do-not-panic.com>

This was added upstream:

mcgrof at frijol ~/linux-stable (git::master)$ git describe --contains bd05f28e
v2.6.29~3^2~47

commit bd05f28e1a15ae62994fe309a524695fe26dd834
Author: Roel Kluin <roel.kluin at gmail.com>
Date:   Tue Mar 3 22:55:21 2009 +0100

    cfg80211: test before subtraction on unsigned

    freq_diff is unsigned, so test before subtraction

    Signed-off-by: Roel Kluin <roel.kluin at gmail.com>
    Signed-off-by: John W. Linville <linville at tuxdriver.com>

Signed-off-by: Luis R. Rodriguez <mcgrof at do-not-panic.com>
---
 intersect.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/intersect.c b/intersect.c
index aa67dbc..e35f2cc 100644
--- a/intersect.c
+++ b/intersect.c
@@ -30,7 +30,8 @@ static int is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
 
 	freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 
-	if (freq_diff == 0 || freq_range->max_bandwidth_khz > freq_diff)
+	if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
+	    freq_range->max_bandwidth_khz > freq_diff)
 		return 0;
 
 	return 1;
-- 
1.7.10.4