linux-kernel - [PATCH] cfg80211: switch from WARN() to pr_warn() in is_user_regdom

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Date:   Tue,  4 Aug 2020 14:05:46 -0700
From:   Rustam Kovhaev <rkovhaev@...il.com>
To:     johannes@...solutions.net, davem@...emloft.net, kuba@...nel.org
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rustam Kovhaev <rkovhaev@...il.com>
Subject: [PATCH] cfg80211: switch from WARN() to pr_warn() in is_user_regdom_saved()

this warning can be triggered by userspace, so it should not cause a
panic if panic_on_warn is set

Reported-and-tested-by: syzbot+d451401ffd00a60677ee@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=d451401ffd00a60677ee
Signed-off-by: Rustam Kovhaev <rkovhaev@...il.com>
---
 net/wireless/reg.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 0d74a31ef0ab..86355938ae8f 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -415,10 +415,10 @@ static bool is_user_regdom_saved(void)
 		return false;
 
 	/* This would indicate a mistake on the design */
-	if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
-		 "Unexpected user alpha2: %c%c\n",
-		 user_alpha2[0], user_alpha2[1]))
+	if (!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2)) {
+		pr_warn("Unexpected user_alpha2: %c%c\n", user_alpha2[0], user_alpha2[1]);
 		return false;
+	}
 
 	return true;
 }
-- 
2.27.0