linux-kernel - [PATCH net-next v3 1/4] net: dql: Avoid calling BUG() when WARN() is enough

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240411192241.2498631-2-leitao@debian.org>
Date: Thu, 11 Apr 2024 12:22:29 -0700
From: Breno Leitao <leitao@...ian.org>
To: kuba@...nel.org,
	davem@...emloft.net,
	pabeni@...hat.com,
	edumazet@...gle.com
Cc: linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH net-next v3 1/4] net: dql: Avoid calling BUG() when WARN() is enough

If the dql_queued() function receives an invalid argument, WARN about it
and continue, instead of crashing the kernel.

This was raised by checkpatch, when I am refactoring this code (see
following patch/commit)

	WARNING: Do not crash the kernel unless it is absolutely unavoidable--use WARN_ON_ONCE() plus recovery code (if feasible) instead of BUG() or variants

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 include/linux/dynamic_queue_limits.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/dynamic_queue_limits.h b/include/linux/dynamic_queue_limits.h
index 5693a4be0d9a..ff9c65841ae8 100644
--- a/include/linux/dynamic_queue_limits.h
+++ b/include/linux/dynamic_queue_limits.h
@@ -91,7 +91,8 @@ static inline void dql_queued(struct dql *dql, unsigned int count)
 {
 	unsigned long map, now, now_hi, i;
 
-	BUG_ON(count > DQL_MAX_OBJECT);
+	if (WARN_ON_ONCE(count > DQL_MAX_OBJECT))
+		return;
 
 	dql->last_obj_cnt = count;
 
-- 
2.43.0