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bcb3b83146
Upon an MDIO CRC error mxl862xx_crc_err_work_fn() walks the DSA ports
and closes the CPU port conduits:
dsa_switch_for_each_cpu_port(dp, priv->ds)
dev_close(dp->conduit);
mxl862xx_remove() unregisters the switch before cancelling this work:
set_bit(MXL862XX_FLAG_WORK_STOPPED, &priv->flags);
cancel_delayed_work_sync(&priv->stats_work);
dsa_unregister_switch(ds);
mxl862xx_host_shutdown(priv);
dsa_unregister_switch() frees the dsa_port objects. If a CRC error
schedules the work during teardown it can run after the ports have been
freed and dereference freed memory.
Guard the port walk with MXL862XX_FLAG_WORK_STOPPED, which is already set
before dsa_unregister_switch(). DSA tears the ports down under
rtnl_lock(), so checking the flag under rtnl_lock() means the work either
runs before teardown and sees valid ports, or runs afterwards, observes
the flag and skips the walk. This mirrors the host_flood_work handler,
which skips torn-down ports under rtnl_lock().
Link: https://sashiko.dev/#/patchset/cover.1780968180.git.daniel%40makrotopia.org?part=2
Fixes:
|
||
|---|---|---|
| .. | ||
| b53 | ||
| hirschmann | ||
| lantiq | ||
| microchip | ||
| mv88e6xxx | ||
| mxl862xx | ||
| netc | ||
| ocelot | ||
| qca | ||
| realtek | ||
| sja1105 | ||
| xrs700x | ||
| bcm_sf2_cfp.c | ||
| bcm_sf2_regs.h | ||
| bcm_sf2.c | ||
| bcm_sf2.h | ||
| dsa_loop.c | ||
| Kconfig | ||
| ks8995.c | ||
| lan9303_i2c.c | ||
| lan9303_mdio.c | ||
| lan9303-core.c | ||
| lan9303.h | ||
| Makefile | ||
| mt7530-mdio.c | ||
| mt7530-mmio.c | ||
| mt7530.c | ||
| mt7530.h | ||
| mv88e6060.c | ||
| mv88e6060.h | ||
| rzn1_a5psw.c | ||
| rzn1_a5psw.h | ||
| vitesse-vsc73xx-core.c | ||
| vitesse-vsc73xx-platform.c | ||
| vitesse-vsc73xx-spi.c | ||
| vitesse-vsc73xx.h | ||
| yt921x.c | ||
| yt921x.h | ||