AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/net/dsa
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Florian Fainelli 8dbe4c5d5e net: dsa: bcm_sf2: Fix node reference count 
of_find_node_by_name() will do an of_node_put() on the "from" argument.
With CONFIG_OF_DYNAMIC enabled which checks for device_node reference
counts, we would be getting a warning like this:

[    6.347230] refcount_t: increment on 0; use-after-free.
[    6.352498] WARNING: CPU: 3 PID: 77 at lib/refcount.c:156
refcount_inc_checked+0x38/0x44
[    6.360601] Modules linked in:
[    6.363661] CPU: 3 PID: 77 Comm: kworker/3:1 Tainted: G        W
5.4.46-gb78b3e9956e6 #13
[    6.372546] Hardware name: BCM97278SV (DT)
[    6.376649] Workqueue: events deferred_probe_work_func
[    6.381796] pstate: 60000005 (nZCv daif -PAN -UAO)
[    6.386595] pc : refcount_inc_checked+0x38/0x44
[    6.391133] lr : refcount_inc_checked+0x38/0x44
...
[    6.478791] Call trace:
[    6.481243]  refcount_inc_checked+0x38/0x44
[    6.485433]  kobject_get+0x3c/0x4c
[    6.488840]  of_node_get+0x24/0x34
[    6.492247]  of_irq_find_parent+0x3c/0xe0
[    6.496263]  of_irq_parse_one+0xe4/0x1d0
[    6.500191]  irq_of_parse_and_map+0x44/0x84
[    6.504381]  bcm_sf2_sw_probe+0x22c/0x844
[    6.508397]  platform_drv_probe+0x58/0xa8
[    6.512413]  really_probe+0x238/0x3fc
[    6.516081]  driver_probe_device+0x11c/0x12c
[    6.520358]  __device_attach_driver+0xa8/0x100
[    6.524808]  bus_for_each_drv+0xb4/0xd0
[    6.528650]  __device_attach+0xd0/0x164
[    6.532493]  device_initial_probe+0x24/0x30
[    6.536682]  bus_probe_device+0x38/0x98
[    6.540524]  deferred_probe_work_func+0xa8/0xd4
[    6.545061]  process_one_work+0x178/0x288
[    6.549078]  process_scheduled_works+0x44/0x48
[    6.553529]  worker_thread+0x218/0x270
[    6.557285]  kthread+0xdc/0xe4
[    6.560344]  ret_from_fork+0x10/0x18
[    6.563925] ---[ end trace 68f65caf69bb152a ]---

Fix this by adding a of_node_get() to increment the reference count
prior to the call.

Fixes: afa3b59295 ("net: dsa: bcm_sf2: Ensure correct sub-node is parsed")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-18 20:44:10 -07:00
..
b53 net: dsa: b53: remove redundant premature assignment to new_pvid 2020-05-27 11:28:23 -07:00
microchip net: dsa: ksz: Select KSZ protocol tag 2020-03-31 10:04:40 -07:00
mv88e6xxx net: dsa: permit cross-chip bridging between all trees in the system 2020-05-10 19:52:33 -07:00
ocelot Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-31 17:48:46 -07:00
qca treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
sja1105 net: dsa: sja1105: fix checks for VLAN state in gate action 2020-06-18 20:20:46 -07:00
bcm_sf2_cfp.c net: dsa: bcm_sf2: Support specifying VLAN tag egress rule 2020-03-30 19:55:42 -07:00
bcm_sf2_regs.h Revert "net: dsa: bcm_sf2: Also configure Port 5 for 2Gb/sec on 7278" 2020-02-26 16:33:35 -08:00
bcm_sf2.c net: dsa: bcm_sf2: Fix node reference count 2020-06-18 20:44:10 -07:00
bcm_sf2.h net: dsa: bcm_sf2: Add support for optional reset controller line 2019-11-05 18:06:38 -08:00
dsa_loop_bdinfo.c
dsa_loop.c net: dsa: loop: Add module soft dependency 2020-05-10 11:24:20 -07:00
dsa_loop.h
Kconfig treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
lan9303_i2c.c
lan9303_mdio.c
lan9303-core.c net: dsa: Get information about stacked DSA protocol 2020-01-08 16:01:13 -08:00
lan9303.h
lantiq_gswip.c net: dsa: lantiq_gswip: fix and improve the unsupported interface error 2020-06-07 17:09:46 -07:00
lantiq_pce.h net: dsa: Use the correct style for SPDX License Identifier 2019-09-22 15:25:08 -07:00
Makefile net: dsa: add support for Atheros AR9331 built-in switch 2019-12-20 17:05:47 -08:00
mt7530.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-24 13:47:27 -07:00
mt7530.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-24 13:47:27 -07:00
mv88e6060.c net: dsa: Get information about stacked DSA protocol 2020-01-08 16:01:13 -08:00
mv88e6060.h
qca8k.c net: dsa: qca8k: Fix "Unexpected gfp" kernel exception 2020-06-04 15:47:10 -07:00
qca8k.h
realtek-smi-core.c net: dsa: remove dsa_switch_alloc helper 2019-10-22 12:37:07 -07:00
realtek-smi-core.h
rtl8366.c net: dsa: rtl8366: Check VLAN ID and not ports 2019-10-02 12:09:23 -04:00
rtl8366rb.c net: dsa: Get information about stacked DSA protocol 2020-01-08 16:01:13 -08:00
vitesse-vsc73xx-core.c net: dsa: vsc73xx: make the MTU configurable 2020-03-27 16:07:25 -07:00
vitesse-vsc73xx-platform.c net: dsa: vsc73xx: convert to devm_platform_ioremap_resource 2020-05-08 22:28:24 -07:00
vitesse-vsc73xx-spi.c net: dsa: vsc73xx: Split vsc73xx driver 2019-07-07 14:16:32 -07:00
vitesse-vsc73xx.h net: dsa: vsc73xx: Split vsc73xx driver 2019-07-07 14:16:32 -07:00