[PATCH net v2 0/2] s390/ctcm: Fix timer bugs in fsm.c

[Nagamani PV <nagamani@linux.ibm.com>]

Fix two bugs in drivers/s390/net/fsm.c found by Sashiko AI code review.

Patch 1 fixes timer list corruption when fsm_addtimer() is called on
an already-pending timer - timer_setup() re-initializes the timer
list_head while it is still enqueued in the wheel.

Patch 2 fixes a use-after-free in channel_remove() - timer_delete()
returns before any running callback finishes, leaving a window where
the timer callback can access freed memory. Fix by waiting for any
running callback to complete before freeing the channel.

Changes in v2:
- Patch 1: fix function name ctcm_send_sweep() -> ctcmpc_send_sweep_req()
  in the commit message (Sashiko netdev-bot)
- Patch 1: call mod_timer() then return 0 explicitly, preserving the
  "Always returns 0" contract documented in fsm.h (Sashiko netdev-bot)
- Patch 2: add Fixes: and Cc: stable@vger.kernel.org tags
  (Sashiko netdev-bot)

Nagamani PV (2):
  s390/ctcm: Fix timer corruption in fsm_addtimer()
  s390/ctcm: Fix use-after-free in channel_remove()

 drivers/s390/net/ctcm_main.c | 4 ++--
 drivers/s390/net/fsm.c       | 9 ++-------
 2 files changed, 4 insertions(+), 9 deletions(-)

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2.53.0