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 15/26] can: usb_8dev: fix memory leak
Date: Mon, 2 Aug 2021 15:44:25 +0200 [thread overview]
Message-ID: <20210802134332.523822865@linuxfoundation.org> (raw)
In-Reply-To: <20210802134332.033552261@linuxfoundation.org>
From: Pavel Skripkin <paskripkin@gmail.com>
commit 0e865f0c31928d6a313269ef624907eec55287c4 upstream.
In usb_8dev_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 usb_8dev_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: 0024d8ad1639 ("can: usb_8dev: Add support for USB2CAN interface from 8 devices")
Link: https://lore.kernel.org/r/d39b458cd425a1cf7f512f340224e6e9563b07bd.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/usb_8dev.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -148,7 +148,8 @@ struct usb_8dev_priv {
u8 *cmd_msg_buffer;
struct mutex usb_8dev_cmd_lock;
-
+ void *rxbuf[MAX_RX_URBS];
+ dma_addr_t rxbuf_dma[MAX_RX_URBS];
};
/* tx frame */
@@ -746,6 +747,7 @@ static int usb_8dev_start(struct usb_8de
for (i = 0; i < MAX_RX_URBS; i++) {
struct urb *urb = NULL;
u8 *buf;
+ dma_addr_t buf_dma;
/* create a URB, and a buffer for it */
urb = usb_alloc_urb(0, GFP_KERNEL);
@@ -756,7 +758,7 @@ static int usb_8dev_start(struct usb_8de
}
buf = usb_alloc_coherent(priv->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);
@@ -764,6 +766,8 @@ static int usb_8dev_start(struct usb_8de
break;
}
+ urb->transfer_dma = buf_dma;
+
usb_fill_bulk_urb(urb, priv->udev,
usb_rcvbulkpipe(priv->udev,
USB_8DEV_ENDP_DATA_RX),
@@ -781,6 +785,9 @@ static int usb_8dev_start(struct usb_8de
break;
}
+ priv->rxbuf[i] = buf;
+ priv->rxbuf_dma[i] = buf_dma;
+
/* Drop reference, USB core will take care of freeing it */
usb_free_urb(urb);
}
@@ -850,6 +857,10 @@ static void unlink_all_urbs(struct usb_8
usb_kill_anchored_urbs(&priv->rx_submitted);
+ for (i = 0; i < MAX_RX_URBS; ++i)
+ usb_free_coherent(priv->udev, RX_BUFFER_SIZE,
+ priv->rxbuf[i], priv->rxbuf_dma[i]);
+
usb_kill_anchored_urbs(&priv->tx_submitted);
atomic_set(&priv->active_tx_urbs, 0);
next prev 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 ` Greg Kroah-Hartman [this message]
2021-08-02 13:44 ` [PATCH 4.4 16/26] can: ems_usb: fix memory leak Greg Kroah-Hartman
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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