[Bug 215197] New: Memory leaks show up a while after usung Edimax Wi-Fi N150 Bluetooth4.0 USB Adapter (rtl8723be)

[Bug 215197] New: Memory leaks show up a while after usung Edimax Wi-Fi N150 Bluetooth4.0 USB Adapter (rtl8723be)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

            Bug ID: 215197
           Summary: Memory leaks show up a while after usung Edimax Wi-Fi
                    N150 Bluetooth4.0 USB Adapter (rtl8723be)
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.16-rc3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: erhard_f@mailbox.org
                CC: pkshih@realtek.com
        Regression: No

Created attachment 299823
  --> https://bugzilla.kernel.org/attachment.cgi?id=299823&action=edit
kmemleak output (5.16-rc3, AMD FX-8370)

The memleak seems to stem from rtl8723be driver:

[...]
unreferenced object 0xffff8881ecc01840 (size 216):
  comm "NetworkManager", pid 506, jiffies 4295033807 (age 10395.817s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffffbb2b8a54>] __alloc_skb+0xa6/0x2d8
    [<ffffffffbb2b8f88>] __netdev_alloc_skb+0x15d/0x2db
    [<ffffffffc20a4639>] rtl8xxxu_submit_rx_urb+0xba/0x2eb [rtl8xxxu]
    [<ffffffffc20a2079>] rtl8xxxu_start+0x7aa/0xa08 [rtl8xxxu]
    [<ffffffffc277ffa6>] drv_start+0xa6/0x124 [mac80211]
    [<ffffffffc27c76c8>] ieee80211_do_open+0x221/0x16ac [mac80211]
    [<ffffffffc27cee04>] ieee80211_open+0x10f/0x1ab [mac80211]
    [<ffffffffbb2fe4a5>] __dev_open+0x1dd/0x2fa
    [<ffffffffbb315c36>] __dev_change_flags+0x136/0x581
    [<ffffffffbb31634b>] dev_change_flags+0x73/0x172
    [<ffffffffbb35ab15>] do_setlink+0x996/0x2d82
    [<ffffffffbb34e302>] rtnl_newlink+0xf3e/0x133b
    [<ffffffffbb3595ec>] rtnetlink_rcv_msg+0x501/0xb11
    [<ffffffffbb426285>] netlink_rcv_skb+0x154/0x319
    [<ffffffffbb4218ec>] netlink_unicast+0x423/0x5c6
    [<ffffffffbb42ae02>] netlink_sendmsg+0x725/0xa98
unreferenced object 0xffff8881ecdf1000 (size 4096):
  comm "NetworkManager", pid 506, jiffies 4295033807 (age 10395.817s)
  hex dump (first 32 bytes):
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
  backtrace:
    [<ffffffffbb2b8dbd>] kmalloc_reserve+0x23/0x91
    [<ffffffffbb2b8a82>] __alloc_skb+0xd4/0x2d8
    [<ffffffffbb2b8f88>] __netdev_alloc_skb+0x15d/0x2db
    [<ffffffffc20a4639>] rtl8xxxu_submit_rx_urb+0xba/0x2eb [rtl8xxxu]
    [<ffffffffc20a2079>] rtl8xxxu_start+0x7aa/0xa08 [rtl8xxxu]
    [<ffffffffc277ffa6>] drv_start+0xa6/0x124 [mac80211]
    [<ffffffffc27c76c8>] ieee80211_do_open+0x221/0x16ac [mac80211]
    [<ffffffffc27cee04>] ieee80211_open+0x10f/0x1ab [mac80211]
    [<ffffffffbb2fe4a5>] __dev_open+0x1dd/0x2fa
    [<ffffffffbb315c36>] __dev_change_flags+0x136/0x581
    [<ffffffffbb31634b>] dev_change_flags+0x73/0x172
    [<ffffffffbb35ab15>] do_setlink+0x996/0x2d82
    [<ffffffffbb34e302>] rtnl_newlink+0xf3e/0x133b
    [<ffffffffbb3595ec>] rtnetlink_rcv_msg+0x501/0xb11
    [<ffffffffbb426285>] netlink_rcv_skb+0x154/0x319
    [<ffffffffbb4218ec>] netlink_unicast+0x423/0x5c6
unreferenced object 0xffff8881ce5c9cc0 (size 216):
  comm "iwd", pid 875, jiffies 4295034039 (age 10395.047s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffffbb2b8a54>] __alloc_skb+0xa6/0x2d8
    [<ffffffffbb2b8f88>] __netdev_alloc_skb+0x15d/0x2db
    [<ffffffffc20a4639>] rtl8xxxu_submit_rx_urb+0xba/0x2eb [rtl8xxxu]
    [<ffffffffc20a2079>] rtl8xxxu_start+0x7aa/0xa08 [rtl8xxxu]
    [<ffffffffc277ffa6>] drv_start+0xa6/0x124 [mac80211]
    [<ffffffffc27c76c8>] ieee80211_do_open+0x221/0x16ac [mac80211]
    [<ffffffffc27cee04>] ieee80211_open+0x10f/0x1ab [mac80211]
    [<ffffffffbb2fe4a5>] __dev_open+0x1dd/0x2fa
    [<ffffffffbb315c36>] __dev_change_flags+0x136/0x581
    [<ffffffffbb31634b>] dev_change_flags+0x73/0x172
    [<ffffffffbb35ab15>] do_setlink+0x996/0x2d82
    [<ffffffffbb34d333>] rtnl_setlink+0x234/0x2c5
    [<ffffffffbb3595ec>] rtnetlink_rcv_msg+0x501/0xb11
    [<ffffffffbb426285>] netlink_rcv_skb+0x154/0x319
    [<ffffffffbb4218ec>] netlink_unicast+0x423/0x5c6
    [<ffffffffbb42ae02>] netlink_sendmsg+0x725/0xa98
unreferenced object 0xffff88820ddd4000 (size 4096):
  comm "iwd", pid 875, jiffies 4295034039 (age 10395.160s)
  hex dump (first 32 bytes):
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
  backtrace:
    [<ffffffffbb2b8dbd>] kmalloc_reserve+0x23/0x91
    [<ffffffffbb2b8a82>] __alloc_skb+0xd4/0x2d8
    [<ffffffffbb2b8f88>] __netdev_alloc_skb+0x15d/0x2db
    [<ffffffffc20a4639>] rtl8xxxu_submit_rx_urb+0xba/0x2eb [rtl8xxxu]
    [<ffffffffc20a2079>] rtl8xxxu_start+0x7aa/0xa08 [rtl8xxxu]
    [<ffffffffc277ffa6>] drv_start+0xa6/0x124 [mac80211]
    [<ffffffffc27c76c8>] ieee80211_do_open+0x221/0x16ac [mac80211]
    [<ffffffffc27cee04>] ieee80211_open+0x10f/0x1ab [mac80211]
    [<ffffffffbb2fe4a5>] __dev_open+0x1dd/0x2fa
    [<ffffffffbb315c36>] __dev_change_flags+0x136/0x581
    [<ffffffffbb31634b>] dev_change_flags+0x73/0x172
    [<ffffffffbb35ab15>] do_setlink+0x996/0x2d82
    [<ffffffffbb34d333>] rtnl_setlink+0x234/0x2c5
    [<ffffffffbb3595ec>] rtnetlink_rcv_msg+0x501/0xb11
    [<ffffffffbb426285>] netlink_rcv_skb+0x154/0x319
    [<ffffffffbb4218ec>] netlink_unicast+0x423/0x5c6
unreferenced object 0xffff8881ce5c90c0 (size 216):
  comm "iwd", pid 875, jiffies 4295034039 (age 10395.160s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffffbb2b8a54>] __alloc_skb+0xa6/0x2d8
    [<ffffffffbb2b8f88>] __netdev_alloc_skb+0x15d/0x2db
    [<ffffffffc20a4639>] rtl8xxxu_submit_rx_urb+0xba/0x2eb [rtl8xxxu]
    [<ffffffffc20a2079>] rtl8xxxu_start+0x7aa/0xa08 [rtl8xxxu]
    [<ffffffffc277ffa6>] drv_start+0xa6/0x124 [mac80211]
    [<ffffffffc27c76c8>] ieee80211_do_open+0x221/0x16ac [mac80211]
    [<ffffffffc27cee04>] ieee80211_open+0x10f/0x1ab [mac80211]
    [<ffffffffbb2fe4a5>] __dev_open+0x1dd/0x2fa
    [<ffffffffbb315c36>] __dev_change_flags+0x136/0x581
    [<ffffffffbb31634b>] dev_change_flags+0x73/0x172
    [<ffffffffbb35ab15>] do_setlink+0x996/0x2d82
    [<ffffffffbb34d333>] rtnl_setlink+0x234/0x2c5
    [<ffffffffbb3595ec>] rtnetlink_rcv_msg+0x501/0xb11
    [<ffffffffbb426285>] netlink_rcv_skb+0x154/0x319
    [<ffffffffbb4218ec>] netlink_unicast+0x423/0x5c6
    [<ffffffffbb42ae02>] netlink_sendmsg+0x725/0xa98
unreferenced object 0xffff88825a144000 (size 4096):
  comm "iwd", pid 875, jiffies 4295034039 (age 10395.160s)
  hex dump (first 32 bytes):
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
    6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
  backtrace:
    [<ffffffffbb2b8dbd>] kmalloc_reserve+0x23/0x91
    [<ffffffffbb2b8a82>] __alloc_skb+0xd4/0x2d8
    [<ffffffffbb2b8f88>] __netdev_alloc_skb+0x15d/0x2db
    [<ffffffffc20a4639>] rtl8xxxu_submit_rx_urb+0xba/0x2eb [rtl8xxxu]
    [<ffffffffc20a2079>] rtl8xxxu_start+0x7aa/0xa08 [rtl8xxxu]
    [<ffffffffc277ffa6>] drv_start+0xa6/0x124 [mac80211]
    [<ffffffffc27c76c8>] ieee80211_do_open+0x221/0x16ac [mac80211]
    [<ffffffffc27cee04>] ieee80211_open+0x10f/0x1ab [mac80211]
    [<ffffffffbb2fe4a5>] __dev_open+0x1dd/0x2fa
    [<ffffffffbb315c36>] __dev_change_flags+0x136/0x581
    [<ffffffffbb31634b>] dev_change_flags+0x73/0x172
    [<ffffffffbb35ab15>] do_setlink+0x996/0x2d82
    [<ffffffffbb34d333>] rtnl_setlink+0x234/0x2c5
    [<ffffffffbb3595ec>] rtnetlink_rcv_msg+0x501/0xb11
    [<ffffffffbb426285>] netlink_rcv_skb+0x154/0x319
    [<ffffffffbb4218ec>] netlink_unicast+0x423/0x5c6

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[Bug 215197] Memory leaks show up a while after usung Edimax Wi-Fi N150 Bluetooth4.0 USB Adapter (rtl8723be)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

--- Comment #1 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 299825
  --> https://bugzilla.kernel.org/attachment.cgi?id=299825&action=edit
kernel -config (5.16-rc3, AMD FX-8370)

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[Bug 215197] Memory leaks show up a while after usung Edimax Wi-Fi N150 Bluetooth4.0 USB Adapter (rtl8723be)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

Erhard F. (erhard_f@mailbox.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #299825|kernel -config (5.16-rc3,   |kernel .config (5.16-rc3,
        description|AMD FX-8370)                |AMD FX-8370)

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[Bug 215197] Memory leaks show up a while after usung Edimax Wi-Fi N150 Bluetooth4.0 USB Adapter (rtl8723be)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

--- Comment #2 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 299827
  --> https://bugzilla.kernel.org/attachment.cgi?id=299827&action=edit
kernel dmesg (5.16-rc3, AMD FX-8370)

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[Bug 215197] Memory leaks show up a while after usung Edimax Wi-Fi N150 Bluetooth4.0 USB Adapter (rtl8723be)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

--- Comment #3 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 299829
  --> https://bugzilla.kernel.org/attachment.cgi?id=299829&action=edit
kernel netconsole.log (5.16-rc3, AMD FX-8370)

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

Erhard F. (erhard_f@mailbox.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |Jes.Sorensen@gmail.com
          Component|Bluetooth                   |network-wireless
            Summary|Memory leaks show up a      |Memory leaks show up when
                   |while after usung Edimax    |using Edimax Wi-Fi N150
                   |Wi-Fi N150 Bluetooth4.0 USB |Bluetooth/Wireless USB
                   |Adapter (rtl8723be)         |Adapter (RTL8XXXU)

--- Comment #4 from Erhard F. (erhard_f@mailbox.org) ---
Still a problem on v6.0-rc4:

 # cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8b7b18611bc0 (size 216):
  comm "iwd", pid 1992, jiffies 4294908755 (age 2333.527s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff9d294858>] kmem_cache_alloc+0x288/0x380
    [<ffffffff9d7f161a>] __alloc_skb+0x8a/0x250
    [<ffffffff9d7f18cc>] __netdev_alloc_skb+0xec/0x190
    [<ffffffffc17f2f1f>] rtl8xxxu_submit_rx_urb+0x4f/0xf0 [rtl8xxxu]
    [<ffffffffc17f0641>] rtl8xxxu_start+0x321/0x8b0 [rtl8xxxu]
    [<ffffffffc16910dd>] drv_start+0x6d/0x120 [mac80211]
    [<ffffffffc16af3e2>] ieee80211_do_open+0x142/0x9c0 [mac80211]
    [<ffffffffc16b2279>] ieee80211_open+0x59/0x80 [mac80211]
    [<ffffffff9d80ad72>] __dev_open+0x122/0x1f0
    [<ffffffff9d815daa>] __dev_change_flags+0xaa/0x200
    [<ffffffff9d81613c>] dev_change_flags+0x1c/0x60
    [<ffffffff9d83575b>] do_setlink+0x4ab/0x10e0
    [<ffffffff9d82f808>] rtnl_setlink+0x218/0x260
    [<ffffffff9d834dbf>] rtnetlink_rcv_msg+0x32f/0x5e0
    [<ffffffff9d880291>] netlink_rcv_skb+0x101/0x130
    [<ffffffff9d87df33>] netlink_unicast+0x1d3/0x2d0
unreferenced object 0xffff8b7b18729a80 (size 216):
  comm "iwd", pid 1992, jiffies 4294997204 (age 2038.757s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
[...]

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

--- Comment #5 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 301807
  --> https://bugzilla.kernel.org/attachment.cgi?id=301807&action=edit
kmemleak output (6.0-rc4, AMD FX-8370)

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

Erhard F. (erhard_f@mailbox.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #299825|0                           |1
        is obsolete|                            |

--- Comment #6 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 301808
  --> https://bugzilla.kernel.org/attachment.cgi?id=301808&action=edit
kernel .config (6.0-rc4, AMD FX-8370)

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215197

Erhard F. (erhard_f@mailbox.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #299829|0                           |1
        is obsolete|                            |

--- Comment #7 from Erhard F. (erhard_f@mailbox.org) ---
Created attachment 301809
  --> https://bugzilla.kernel.org/attachment.cgi?id=301809&action=edit
kernel dmesg (6.0-r43, AMD FX-8370)

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

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https://bugzilla.kernel.org/show_bug.cgi?id=215197

rtl8821cerfe2@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rtl8821cerfe2@gmail.com

--- Comment #8 from rtl8821cerfe2@gmail.com ---
Hi!

Can you check if this 100% untested patch fixes the leak?

diff --git a/rtl8xxxu_core.c b/rtl8xxxu_core.c
index 39f43c0..b60cc31 100644
--- a/rtl8xxxu_core.c
+++ b/rtl8xxxu_core.c
@@ -5805,10 +5805,11 @@ static void rtl8xxxu_c2hcmd_callback(struct work_struct
*work)
                default:
                        break;
                }
+
+               dev_kfree_skb(skb);
        }

 out:
-       dev_kfree_skb(skb);
 }

 static void rtl8723bu_handle_c2h(struct rtl8xxxu_priv *priv,

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

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--- Comment #9 from Erhard F. (erhard_f@mailbox.org) ---
Thanks! I can test in about 3 weeks and will report back. The machine & stick
in question are not at my place.

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

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--- Comment #10 from Erhard F. (erhard_f@mailbox.org) ---
(In reply to rtl8821cerfe2 from comment #8)
> Hi!
> 
> Can you check if this 100% untested patch fixes the leak?
Checked it out today. Seems you nailed it with your 100% untested patch! :)

I needed to take a small modification however or else I get a
"drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c:5609:1: error: expected
statement" at building.

The ';' before the function end needs to stay as 'out:' expects a statement
next. Sure ugly as hell but so is the accompanying goto a few lines above.


--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c     2022-12-09
01:51:56.213989176 +0100
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.cn    2022-12-09
01:56:35.543654839 +0100
@@ -5601,10 +5601,12 @@
                default:
                        break;
                }
+
+               dev_kfree_skb(skb);
        }

 out:
-       dev_kfree_skb(skb);
+       ;
 }

 static void rtl8723bu_handle_c2h(struct rtl8xxxu_priv *priv,


Patch applies on v6.1-rc8 and with this small modification building succeeds.
With the patch applied I have not seen the memleak since, even when taking
actions provoking it faster (e.g. unplugging and re-plugging the USB adapter
while playing sound). Without the patch v6.1-rc8 still shows the leak.

And so far I have not noticed any side effects of the patch in kernel dmesg.

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

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--- Comment #11 from rtl8821cerfe2@gmail.com ---
Thanks for testing. Can I say "Tested-by: Erhard F. <your email>" in the commit
message when I send the patch upstream? And also "Reported-by: ..."

I'll remove the goto because it causes memory leaks with the RTL8192EU.

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

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--- Comment #12 from Erhard F. (erhard_f@mailbox.org) ---
Yes you can. And thanks for your work on the patch!

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[Bug 215197] Memory leaks show up when using Edimax Wi-Fi N150 Bluetooth/Wireless USB Adapter (RTL8XXXU)

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Erhard F. (erhard_f@mailbox.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |OBSOLETE

--- Comment #13 from Erhard F. (erhard_f@mailbox.org) ---
Seems the fix has found upstream meanwhile. At least I can no longer reproduce
the issue on current kernels.

Closing as obsolete.

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