diff mbox series

[5.10,060/717] nl80211/cfg80211: fix potential infinite loop

Message ID 20201228125023.872264837@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Dec. 28, 2020, 12:40 p.m. UTC 
From: Colin Ian King <colin.king@canonical.com>

[ Upstream commit ba5c25236bc3d399df82ebe923490ea8d2d35cf2 ]

The for-loop iterates with a u8 loop counter and compares this
with the loop upper limit of request->n_ssids which is an int type.
There is a potential infinite loop if n_ssids is larger than the
u8 loop counter, so fix this by making the loop counter an int.

Addresses-Coverity: ("Infinite loop")
Fixes: c8cb5b854b40 ("nl80211/cfg80211: support 6 GHz scanning")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20201029222407.390218-1-colin.king@canonical.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/wireless/scan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 8d0e49c46db37..3409f37d838b3 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -694,7 +694,7 @@  static  void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
 				     struct cfg80211_scan_request *request)
 {
-	u8 i;
+	int i;
 	u32 s_ssid;
 
 	for (i = 0; i < request->n_ssids; i++) {