[PATCH 4.4 086/162] libertas: Fix possible memory leak in probe and disconnect

Greg Kroah-Hartman
2021-11-24T12:06:25Z

From: Wang Hai <wanghai38@huawei.com>

[ Upstream commit 9692151e2fe7a326bafe99836fd1f20a2cc3a049 ]

I got memory leak as follows when doing fault injection test:

unreferenced object 0xffff88812c7d7400 (size 512):
comm "kworker/6:1", pid 176, jiffies 4295003332 (age 822.830s)
hex dump (first 32 bytes):
00 68 1e 04 81 88 ff ff 01 00 00 00 00 00 00 00 .h..............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff8167939c>] slab_post_alloc_hook+0x9c/0x490
[<ffffffff8167f627>] kmem_cache_alloc_trace+0x1f7/0x470
[<ffffffffa02c9873>] if_usb_probe+0x63/0x446 [usb8xxx]
[<ffffffffa022668a>] usb_probe_interface+0x1aa/0x3c0 [usbcore]
[<ffffffff82b59630>] really_probe+0x190/0x480
[<ffffffff82b59a19>] __driver_probe_device+0xf9/0x180
[<ffffffff82b59af3>] driver_probe_device+0x53/0x130
[<ffffffff82b5a075>] __device_attach_driver+0x105/0x130
[<ffffffff82b55949>] bus_for_each_drv+0x129/0x190
[<ffffffff82b593c9>] __device_attach+0x1c9/0x270
[<ffffffff82b5a250>] device_initial_probe+0x20/0x30
[<ffffffff82b579c2>] bus_probe_device+0x142/0x160
[<ffffffff82b52e49>] device_add+0x829/0x1300
[<ffffffffa02229b1>] usb_set_configuration+0xb01/0xcc0 [usbcore]
[<ffffffffa0235c4e>] usb_generic_driver_probe+0x6e/0x90 [usbcore]
[<ffffffffa022641f>] usb_probe_device+0x6f/0x130 [usbcore]

cardp is missing being freed in the error handling path of the probe
and the path of the disconnect, which will cause memory leak.

This patch adds the missing kfree().

Fixes: 876c9d3aeb98 ("[PATCH] Marvell Libertas 8388 802.11b/g USB driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211020120345.2016045-3-wanghai38@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/libertas/if_usb.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/libertas/if_usb.c b/drivers/net/wireless/libertas/if_usb.c
index d271eaf1f9499..1793611a380c8 100644
--- a/drivers/net/wireless/libertas/if_usb.c
+++ b/drivers/net/wireless/libertas/if_usb.c
@@ -291,6 +291,7 @@ err_add_card:
if_usb_reset_device(cardp);
dealloc:
if_usb_free(cardp);
+ kfree(cardp);

error:
return r;
@@ -317,6 +318,7 @@ static void if_usb_disconnect(struct usb_interface *intf)

/* Unlink and free urb */
if_usb_free(cardp);
+ kfree(cardp);

usb_set_intfdata(intf, NULL);
usb_put_dev(interface_to_usbdev(intf));
--
2.33.0