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 61909847F for ; Fri, 10 Mar 2023 13:58:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB371C4339B; Fri, 10 Mar 2023 13:58:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678456698; bh=dKrz7kU27bUbPOR2Cfrp+nKYGHZXrtgkSoaPoNk/cU0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BbADiIME/UXpHQFmb6Mcq70h8DXd2mbBLbZVsubQGjBvFXjEu/BPUz2GcKDXpkwWl qOfyZfVgtq0ezITP7rb5PvqTzARpU7bMoeZlt4zx6GHVh3GduBt1YAH2yp3AXEhFli vR10zYr/Z1gCAY9VcM/+XRkDhelOZ5EiqP8NYZKw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+df64c0a2e8d68e78a4fa@syzkaller.appspotmail.com, Fedor Pchelkin , Alexey Khoroshilov , "David S. Miller" , Sasha Levin Subject: [PATCH 6.2 093/211] nfc: fix memory leak of se_io context in nfc_genl_se_io Date: Fri, 10 Mar 2023 14:37:53 +0100 Message-Id: <20230310133721.610731383@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133718.689332661@linuxfoundation.org> References: <20230310133718.689332661@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Fedor Pchelkin [ Upstream commit 25ff6f8a5a3b8dc48e8abda6f013e8cc4b14ffea ] The callback context for sending/receiving APDUs to/from the selected secure element is allocated inside nfc_genl_se_io and supposed to be eventually freed in se_io_cb callback function. However, there are several error paths where the bwi_timer is not charged to call se_io_cb later, and the cb_context is leaked. The patch proposes to free the cb_context explicitly on those error paths. At the moment we can't simply check 'dev->ops->se_io()' return value as it may be negative in both cases: when the timer was charged and was not. Fixes: 5ce3f32b5264 ("NFC: netlink: SE API implementation") Reported-by: syzbot+df64c0a2e8d68e78a4fa@syzkaller.appspotmail.com Signed-off-by: Fedor Pchelkin Signed-off-by: Alexey Khoroshilov Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/nfc/st-nci/se.c | 6 ++++++ drivers/nfc/st21nfca/se.c | 6 ++++++ net/nfc/netlink.c | 4 ++++ 3 files changed, 16 insertions(+) diff --git a/drivers/nfc/st-nci/se.c b/drivers/nfc/st-nci/se.c index ec87dd21e054a..b2f1ced8e6dd2 100644 --- a/drivers/nfc/st-nci/se.c +++ b/drivers/nfc/st-nci/se.c @@ -672,6 +672,12 @@ int st_nci_se_io(struct nci_dev *ndev, u32 se_idx, ST_NCI_EVT_TRANSMIT_DATA, apdu, apdu_length); default: + /* Need to free cb_context here as at the moment we can't + * clearly indicate to the caller if the callback function + * would be called (and free it) or not. In both cases a + * negative value may be returned to the caller. + */ + kfree(cb_context); return -ENODEV; } } diff --git a/drivers/nfc/st21nfca/se.c b/drivers/nfc/st21nfca/se.c index df8d27cf2956b..dae288bebcb5a 100644 --- a/drivers/nfc/st21nfca/se.c +++ b/drivers/nfc/st21nfca/se.c @@ -236,6 +236,12 @@ int st21nfca_hci_se_io(struct nfc_hci_dev *hdev, u32 se_idx, ST21NFCA_EVT_TRANSMIT_DATA, apdu, apdu_length); default: + /* Need to free cb_context here as at the moment we can't + * clearly indicate to the caller if the callback function + * would be called (and free it) or not. In both cases a + * negative value may be returned to the caller. + */ + kfree(cb_context); return -ENODEV; } } diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c index 1fc339084d897..348bf561bc9fb 100644 --- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -1442,7 +1442,11 @@ static int nfc_se_io(struct nfc_dev *dev, u32 se_idx, rc = dev->ops->se_io(dev, se_idx, apdu, apdu_length, cb, cb_context); + device_unlock(&dev->dev); + return rc; + error: + kfree(cb_context); device_unlock(&dev->dev); return rc; } -- 2.39.2