From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 624622DE1FA; Tue, 8 Jul 2025 16:56:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751993772; cv=none; b=FyOCZ4IjbayOdmU4E29rR3KGuutaJEhJOmn4W/uyx9aYaPIYdYFwRzZHUQSMqno9frEeEhO9+fmv218vqbuqYCLs+d7n9nLn0kR6nTwaaxaEjWeNyfzhZdMY8QqnGAK6jk80ivMVRkZiEZnjhpZvLhS0I+Y/u7KQzsWTwjgAgEg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751993772; c=relaxed/simple; bh=o78DTNbxZXtms7/mPPMmLDwK3EsbrUEgWbKVVQB7S1Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DzePh5nm6Uf5YkSYoZ51AUUqH9eMHjwOb3UdJltWjiq3fnyMgnkw0h12jPxLYvTynRO4UiUd3Zwrbgkwu4CEdWBD5U7BWKDl9xphFr5bGTl42cNjGIdZ373k9BdbE6JMVEwPd3rT7GG2eY/gvtHxMomuhfXsdZF9+iAq/WZ363Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fCxXH62F; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fCxXH62F" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DBF39C4CEED; Tue, 8 Jul 2025 16:56:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1751993772; bh=o78DTNbxZXtms7/mPPMmLDwK3EsbrUEgWbKVVQB7S1Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fCxXH62FhZgpnOl+PIxjwGeTNrJfHY7qdyfzgzApCpMWsxmjbMxvivTqCVPFtif7g Mx7U0ob2y9AkT/9Vrnfx7/TfPST04hEmpUo3zLGoOeFK33YRWI7hCNRIFB6L1w+xms OrIFwmilrZh7x+d9fpf+L4Lfcold+/dD3xW/X8es= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Peng Fan , Jassi Brar , Sasha Levin Subject: [PATCH 5.15 004/160] mailbox: Not protect module_put with spin_lock_irqsave Date: Tue, 8 Jul 2025 18:20:41 +0200 Message-ID: <20250708162231.628895447@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250708162231.503362020@linuxfoundation.org> References: <20250708162231.503362020@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Peng Fan [ Upstream commit dddbd233e67e792bb0a3f9694a4707e6be29b2c6 ] &chan->lock is not supposed to protect 'chan->mbox'. And in __mbox_bind_client, try_module_get is also not protected by &chan->lock. So move module_put out of the lock protected region. Signed-off-by: Peng Fan Signed-off-by: Jassi Brar Signed-off-by: Sasha Levin --- drivers/mailbox/mailbox.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 6f54501dc7762..cb31ad917b352 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -459,8 +459,8 @@ void mbox_free_channel(struct mbox_chan *chan) if (chan->txdone_method == TXDONE_BY_ACK) chan->txdone_method = TXDONE_BY_POLL; - module_put(chan->mbox->dev->driver->owner); spin_unlock_irqrestore(&chan->lock, flags); + module_put(chan->mbox->dev->driver->owner); } EXPORT_SYMBOL_GPL(mbox_free_channel); -- 2.39.5