[PATCH AUTOSEL 5.15 04/17] nl80211: validate S1G channel width

[Sasha Levin <sashal@kernel.org>]

From: Kieran Frewen <kieran.frewen@morsemicro.com>

[ Upstream commit 5d087aa759eb82b8208411913f6c2158bd85abc0 ]

Validate the S1G channel width input by user to ensure it matches
that of the requested channel

Signed-off-by: Kieran Frewen <kieran.frewen@morsemicro.com>
Signed-off-by: Bassem Dawood <bassem@morsemicro.com>
Link: https://lore.kernel.org/r/20220420041321.3788789-2-kieran.frewen@morsemicro.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/wireless/nl80211.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index fe9cade6b4fb..9fae09e860e1 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3080,6 +3080,15 @@ int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
 	} else if (attrs[NL80211_ATTR_CHANNEL_WIDTH]) {
 		chandef->width =
 			nla_get_u32(attrs[NL80211_ATTR_CHANNEL_WIDTH]);
+		if (chandef->chan->band == NL80211_BAND_S1GHZ) {
+			/* User input error for channel width doesn't match channel  */
+			if (chandef->width != ieee80211_s1g_channel_width(chandef->chan)) {
+				NL_SET_ERR_MSG_ATTR(extack,
+						    attrs[NL80211_ATTR_CHANNEL_WIDTH],
+						    "bad channel width");
+				return -EINVAL;
+			}
+		}
 		if (attrs[NL80211_ATTR_CENTER_FREQ1]) {
 			chandef->center_freq1 =
 				nla_get_u32(attrs[NL80211_ATTR_CENTER_FREQ1]);
-- 
2.35.1