From patchwork Wed Dec 28 22:40:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fedor Pchelkin X-Patchwork-Id: 13083232 X-Patchwork-Delegate: toke@redhat.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 014ACC4332F for ; Wed, 28 Dec 2022 22:41:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231578AbiL1WlE (ORCPT ); Wed, 28 Dec 2022 17:41:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56170 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229630AbiL1WlC (ORCPT ); Wed, 28 Dec 2022 17:41:02 -0500 Received: from mail.ispras.ru (mail.ispras.ru [83.149.199.84]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 82379258; Wed, 28 Dec 2022 14:41:01 -0800 (PST) Received: from fedcomp.intra.ispras.ru (unknown [46.242.14.200]) by mail.ispras.ru (Postfix) with ESMTPSA id EEA2940737D4; Wed, 28 Dec 2022 22:40:59 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.ispras.ru EEA2940737D4 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ispras.ru; s=default; t=1672267260; bh=yAe/xSvn4I4BDY4nXAoWtF0FbwyCZJFaP8UyARdW5hU=; h=From:To:Cc:Subject:Date:From; b=XaDnrIsUaEQAqsWu7EDbJqxAhW6D8aRfyNfPYxOn+01FDM2oLQeDNDuooar2h/ImU K+SLOZFcPjvPBBYc4OpKgcauRNnGQU9p7vQVlqUa1j7/suZJViRXY8GXbhtb4fhoKh lpOjywYp76syTpPKfwqjmIDcrYdSCtw7otTov0TI= From: Fedor Pchelkin To: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Kalle Valo Cc: Fedor Pchelkin , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Sujith , "John W. Linville" , Vasanthakumar Thiagarajan , Senthil Balasubramanian , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Alexey Khoroshilov , lvc-project@linuxtesting.org Subject: [PATCH] wifi: ath9k: htc_hst: free skb in ath9k_htc_rx_msg() if there is no callback function Date: Thu, 29 Dec 2022 01:40:47 +0300 Message-Id: <20221228224047.146399-1-pchelkin@ispras.ru> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org It is stated that ath9k_htc_rx_msg() either frees the provided skb or passes its management to another callback function. However, the skb is not freed in case there is no another callback function, and Syzkaller was able to cause a memory leak. Also minor comment fix. Found by Linux Verification Center (linuxtesting.org) with Syzkaller. Fixes: fb9987d0f748 ("ath9k_htc: Support for AR9271 chipset.") Signed-off-by: Fedor Pchelkin Signed-off-by: Alexey Khoroshilov --- drivers/net/wireless/ath/ath9k/htc_hst.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/htc_hst.c b/drivers/net/wireless/ath/ath9k/htc_hst.c index ca05b07a45e6..7d5041eb5f29 100644 --- a/drivers/net/wireless/ath/ath9k/htc_hst.c +++ b/drivers/net/wireless/ath/ath9k/htc_hst.c @@ -391,7 +391,7 @@ static void ath9k_htc_fw_panic_report(struct htc_target *htc_handle, * HTC Messages are handled directly here and the obtained SKB * is freed. * - * Service messages (Data, WMI) passed to the corresponding + * Service messages (Data, WMI) are passed to the corresponding * endpoint RX handlers, which have to free the SKB. */ void ath9k_htc_rx_msg(struct htc_target *htc_handle, @@ -478,6 +478,8 @@ void ath9k_htc_rx_msg(struct htc_target *htc_handle, if (endpoint->ep_callbacks.rx) endpoint->ep_callbacks.rx(endpoint->ep_callbacks.priv, skb, epid); + else + kfree_skb(skb); } }