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Subject[PATCH AUTOSEL 4.19 091/192] mt76: usb: do not run mt76u_queues_deinit twice
Date
From: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>

[ Upstream commit b3098121c42caaf3aea239b8655cf52d45be116f ]

Do not call mt76u_queues_deinit routine in mt76u_alloc_queues error path
since it will be run in mt76x0u_register_device or
mt76x2u_register_device error path. Current implementation triggers the
following kernel warning:

[ 67.005516] WARNING: CPU: 2 PID: 761 at lib/refcount.c:187 refcount_sub_and_test_checked+0xa4/0xb8
[ 67.019513] refcount_t: underflow; use-after-free.
[ 67.099872] Hardware name: BCM2835
[ 67.106268] Backtrace:
[ 67.111584] [<8010c91c>] (dump_backtrace) from [<8010cc00>] (show_stack+0x20/0x24)
[ 67.124974] r6:60000013 r5:ffffffff r4:00000000 r3:a50bade6
[ 67.132226] [<8010cbe0>] (show_stack) from [<807ca5f4>] (dump_stack+0xc8/0x114)
[ 67.141225] [<807ca52c>] (dump_stack) from [<8011e65c>] (__warn+0xf4/0x120)
[ 67.149849] r9:000000bb r8:804d0138 r7:00000009 r6:8099dc84 r5:00000000 r4:b66c7b58
[ 67.160767] [<8011e568>] (__warn) from [<8011e6d0>] (warn_slowpath_fmt+0x48/0x50)
[ 67.171436] r9:7f65e128 r8:80d1419c r7:80c0bac4 r6:b97b3044 r5:b7368e00 r4:00000000
[ 67.182433] [<8011e68c>] (warn_slowpath_fmt) from [<804d0138>] (refcount_sub_and_test_checked+0xa4/0xb8)
[ 67.195221] r3:80c91c25 r2:8099dc94
[ 67.200370] r4:00000000
[ 67.204397] [<804d0094>] (refcount_sub_and_test_checked) from [<804d0164>] (refcount_dec_and_test_checked+0x18/0x1c)
[ 67.218046] r4:b7368e00 r3:00000001
[ 67.223125] [<804d014c>] (refcount_dec_and_test_checked) from [<805db49c>] (usb_free_urb+0x20/0x4c)
[ 67.235358] [<805db47c>] (usb_free_urb) from [<7f639804>] (mt76u_buf_free+0x98/0xac [mt76_usb])
[ 67.247302] r4:00000001 r3:00000001
[ 67.252468] [<7f63976c>] (mt76u_buf_free [mt76_usb]) from [<7f639ef8>] (mt76u_queues_deinit+0x44/0x100 [mt76_usb])
[ 67.266102] r8:b8fe8600 r7:b5dac480 r6:b5dace20 r5:00000001 r4:00000000 r3:00000080
[ 67.277132] [<7f639eb4>] (mt76u_queues_deinit [mt76_usb]) from [<7f65c040>] (mt76x0u_cleanup+0x40/0x4c [mt76x0u])
[ 67.290737] r7:b5dac480 r6:b8fe8600 r5:ffffffea r4:b5dace20
[ 67.298069] [<7f65c000>] (mt76x0u_cleanup [mt76x0u]) from [<7f65c564>] (mt76x0u_probe+0x1f0/0x354 [mt76x0u])
[ 67.311174] r4:b5dace20 r3:00000000
[ 67.316312] [<7f65c374>] (mt76x0u_probe [mt76x0u]) from [<805e0b6c>] (usb_probe_interface+0x104/0x240)
[ 67.328915] r7:00000000 r6:7f65e034 r5:b6634800 r4:b8fe8620
[ 67.336276] [<805e0a68>] (usb_probe_interface) from [<8056a8bc>] (really_probe+0x224/0x2f8)
[ 67.347965] r10:b65f0a00 r9:00000019 r8:7f65e034 r7:80d3e124 r6:00000000 r5:80d3e120
[ 67.359175] r4:b8fe8620 r3:805e0a68
[ 67.364384] [<8056a698>] (really_probe) from [<8056ab60>] (driver_probe_device+0x6c/0x180)
[ 67.375974] r10:b65f0a00 r9:7f65e2c0 r8:b8fe8620 r7:00000000 r6:7f65e034 r5:7f65e034
[ 67.387170] r4:b8fe8620 r3:00000000
[ 67.392378] [<8056aaf4>] (driver_probe_device) from [<8056ad54>] (__driver_attach+0xe0/0xe4)
[ 67.404097] r9:7f65e2c0 r8:7f65d22c r7:00000000 r6:b8fe8654 r5:7f65e034 r4:b8fe8620
[ 67.415122] [<8056ac74>] (__driver_attach) from [<8056880c>] (bus_for_each_dev+0x68/0xa0)
[ 67.426628] r6:8056ac74 r5:7f65e034 r4:00000000 r3:00000027
[ 67.434017] [<805687a4>] (bus_for_each_dev) from [<8056a1cc>] (driver_attach+0x28/0x30)
[ 67.445394] r6:80c6ddc8 r5:b7368f80 r4:7f65e034
[ 67.451703] [<8056a1a4>] (driver_attach) from [<80569c24>] (bus_add_driver+0x194/0x21c)
[ 67.463081] [<80569a90>] (bus_add_driver) from [<8056b504>] (driver_register+0x8c/0x124)
[ 67.474560] r7:80c6ddc8 r6:7f65e034 r5:00000000 r4:7f65e034
[ 67.481964] [<8056b478>] (driver_register) from [<805df510>] (usb_register_driver+0x74/0x140)
[ 67.493901] r5:00000000 r4:7f65e000
[ 67.499131] [<805df49c>] (usb_register_driver) from [<7f661024>] (mt76x0_driver_init+0x24/0x1000 [mt76x0u])
[ 67.512258] r9:00000001 r8:7f65e308 r7:00000000 r6:80c08d48 r5:7f661000 r4:7f65e2c0
[ 67.523404] [<7f661000>] (mt76x0_driver_init [mt76x0u]) from [<80102f6c>] (do_one_initcall+0x4c/0x210)
[ 67.536142] [<80102f20>] (do_one_initcall) from [<801ae63c>] (do_init_module+0x6c/0x21c)
[ 67.547639] r8:7f65e308 r7:80c08d48 r6:b65f0ac0 r5:7f65e2c0 r4:7f65e2c0
[ 67.556129] [<801ae5d0>] (do_init_module) from [<801ad68c>] (load_module+0x1d10/0x2304)

Fixes: b40b15e1521f ("mt76: add usb support to mt76 layer")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/mediatek/mt76/usb.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c
index 79e59f2379a2..8d40e92fb6f2 100644
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c
@@ -796,16 +796,9 @@ int mt76u_alloc_queues(struct mt76_dev *dev)

err = mt76u_alloc_rx(dev);
if (err < 0)
- goto err;
-
- err = mt76u_alloc_tx(dev);
- if (err < 0)
- goto err;
+ return err;

- return 0;
-err:
- mt76u_queues_deinit(dev);
- return err;
+ return mt76u_alloc_tx(dev);
}
EXPORT_SYMBOL_GPL(mt76u_alloc_queues);

--
2.19.1
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