[PATCH 0/2] mtd: spi-nor: Fix unbind deadlock and use-after-free

[tze.yee.ng@altera.com]

From: Tze Yee Ng <tze.yee.ng@altera.com>

Two fixes in the spi-nor core around locking and driver unbind:

Patch 1 fixes a self-deadlock in spi_nor_rww_start_exclusive(), which
took nor->lock while its end helper re-acquired it via guard(mutex).

Patch 2 fixes a use-after-free where a sysfs unbind frees the
devm-allocated spi_nor while /dev/mtdX is still open. Give it a kref
lifetime on the spi-mem probe path and fail operations with -ENODEV
after unbind. Legacy controllers are unchanged.

Tze Yee Ng (2):
  mtd: spi-nor: Fix deadlock in spi_nor_rww_start_exclusive()
  mtd: spi-nor: core: Fix use-after-free of spi_nor on unbind with open
    handles

 drivers/mtd/spi-nor/core.c  | 113 ++++++++++++++++++++++++++++++++----
 include/linux/mtd/spi-nor.h |  17 ++++++
 2 files changed, 119 insertions(+), 11 deletions(-)

-- 
2.43.7