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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Pavel Skripkin <paskripkin@gmail.com>,
	Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [PATCH 4.4 16/26] can: ems_usb: fix memory leak
Date: Mon,  2 Aug 2021 15:44:26 +0200	[thread overview]
Message-ID: <20210802134332.561784418@linuxfoundation.org> (raw)
In-Reply-To: <20210802134332.033552261@linuxfoundation.org>

From: Pavel Skripkin <paskripkin@gmail.com>

commit 9969e3c5f40c166e3396acc36c34f9de502929f6 upstream.

In ems_usb_start() MAX_RX_URBS coherent buffers are allocated and
there is nothing, that frees them:

1) In callback function the urb is resubmitted and that's all
2) In disconnect function urbs are simply killed, but URB_FREE_BUFFER
   is not set (see ems_usb_start) and this flag cannot be used with
   coherent buffers.

So, all allocated buffers should be freed with usb_free_coherent()
explicitly.

Side note: This code looks like a copy-paste of other can drivers. The
same patch was applied to mcba_usb driver and it works nice with real
hardware. There is no change in functionality, only clean-up code for
coherent buffers.

Fixes: 702171adeed3 ("ems_usb: Added support for EMS CPC-USB/ARM7 CAN/USB interface")
Link: https://lore.kernel.org/r/59aa9fbc9a8cbf9af2bbd2f61a659c480b415800.1627404470.git.paskripkin@gmail.com
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/can/usb/ems_usb.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -267,6 +267,8 @@ struct ems_usb {
 	unsigned int free_slots; /* remember number of available slots */
 
 	struct ems_cpc_msg active_params; /* active controller parameters */
+	void *rxbuf[MAX_RX_URBS];
+	dma_addr_t rxbuf_dma[MAX_RX_URBS];
 };
 
 static void ems_usb_read_interrupt_callback(struct urb *urb)
@@ -600,6 +602,7 @@ static int ems_usb_start(struct ems_usb
 	for (i = 0; i < MAX_RX_URBS; i++) {
 		struct urb *urb = NULL;
 		u8 *buf = NULL;
+		dma_addr_t buf_dma;
 
 		/* create a URB, and a buffer for it */
 		urb = usb_alloc_urb(0, GFP_KERNEL);
@@ -610,7 +613,7 @@ static int ems_usb_start(struct ems_usb
 		}
 
 		buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
-					 &urb->transfer_dma);
+					 &buf_dma);
 		if (!buf) {
 			netdev_err(netdev, "No memory left for USB buffer\n");
 			usb_free_urb(urb);
@@ -618,6 +621,8 @@ static int ems_usb_start(struct ems_usb
 			break;
 		}
 
+		urb->transfer_dma = buf_dma;
+
 		usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
 				  buf, RX_BUFFER_SIZE,
 				  ems_usb_read_bulk_callback, dev);
@@ -633,6 +638,9 @@ static int ems_usb_start(struct ems_usb
 			break;
 		}
 
+		dev->rxbuf[i] = buf;
+		dev->rxbuf_dma[i] = buf_dma;
+
 		/* Drop reference, USB core will take care of freeing it */
 		usb_free_urb(urb);
 	}
@@ -698,6 +706,10 @@ static void unlink_all_urbs(struct ems_u
 
 	usb_kill_anchored_urbs(&dev->rx_submitted);
 
+	for (i = 0; i < MAX_RX_URBS; ++i)
+		usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
+				  dev->rxbuf[i], dev->rxbuf_dma[i]);
+
 	usb_kill_anchored_urbs(&dev->tx_submitted);
 	atomic_set(&dev->active_tx_urbs, 0);
 



  parent reply	other threads:[~2021-08-02 13:46 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 13:44 [PATCH 4.4 00/26] 4.4.278-rc1 review Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 01/26] net: split out functions related to registering inflight socket files Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 02/26] af_unix: fix garbage collect vs MSG_PEEK Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 03/26] workqueue: fix UAF in pwq_unbound_release_workfn() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 04/26] net/802/mrp: fix memleak in mrp_request_join() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 05/26] net/802/garp: fix memleak in garp_request_join() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 06/26] sctp: move 198 addresses from unusable to private scope Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 07/26] hfs: add missing clean-up in hfs_fill_super Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 08/26] hfs: fix high memory mapping in hfs_bnode_read Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 09/26] hfs: add lock nesting notation to hfs_find_init Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 10/26] ARM: dts: versatile: Fix up interrupt controller node names Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 11/26] lib/string.c: add multibyte memset functions Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 12/26] ARM: ensure the signal page contains defined contents Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 13/26] ocfs2: fix zero out valid data Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 14/26] ocfs2: issue zeroout to EOF blocks Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 15/26] can: usb_8dev: fix memory leak Greg Kroah-Hartman
2021-08-02 13:44 ` Greg Kroah-Hartman [this message]
2021-08-02 13:44 ` [PATCH 4.4 17/26] can: esd_usb2: " Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 18/26] NIU: fix incorrect error return, missed in previous revert Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 19/26] x86/asm: Ensure asm/proto.h can be included stand-alone Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 20/26] cfg80211: Fix possible memory leak in function cfg80211_bss_update Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 21/26] netfilter: nft_nat: allow to specify layer 4 protocol NAT only Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 22/26] tipc: fix sleeping in tipc accept routine Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 23/26] mlx4: Fix missing error code in mlx4_load_one() Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 24/26] net: llc: fix skb_over_panic Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 25/26] tulip: windbond-840: Fix missing pci_disable_device() in probe and remove Greg Kroah-Hartman
2021-08-02 13:44 ` [PATCH 4.4 26/26] sis900: " Greg Kroah-Hartman
2021-08-02 17:51 ` [PATCH 4.4 00/26] 4.4.278-rc1 review Pavel Machek
2021-08-03 14:57 ` Naresh Kamboju
2021-08-03 19:14 ` Guenter Roeck

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