[PATCH v7 0/2] HID: multitouch: fix use-after-free of haptic data on delayed input release

[Aldo Ariel Panzardo <qwe.aldo@gmail.com>]

v7 fixes issues found by Sashiko on v5 and v6.

Patch 1 now moves input_set_capability(EV_FF) after input_ff_create()
so the capability is not advertised when FF setup fails -- the caller
masks the error and EVIOCGEFFECTS would deref a NULL dev->ff.

Patch 2 keeps the devm_add_action() design.  Changes since v5:
  - module_put in hid_haptic_destroy (not devm_release) so the module
    stays loaded until FF is done; __module_get for devm_release itself
  - guard against double-init (return 0 when haptic->wq is set)
  - NULL haptic->hdev and haptic->input_dev after put in devm_release
  - restore dev->flush/event on devm_add_action failure

v6: https://lore.kernel.org/linux-input/20261016151343.3120300-1-qwe.aldo@gmail.com/
v5: https://lore.kernel.org/linux-input/20261016135516.2957381-1-qwe.aldo@gmail.com/
v4: https://lore.kernel.org/linux-input/20261009103333.2476105-1-qwe.aldo@gmail.com/
v1: https://lore.kernel.org/linux-input/20261009031207.3233206-1-qwe.aldo@gmail.com/

Aldo Ariel Panzardo (2):
  HID: haptic: reorder try_module_get/get_device before input_ff_create
  HID: multitouch: fix use-after-free of haptic data on delayed input
    release

 drivers/hid/hid-haptic.c | 105 +++++++++++++++++++++++++++++++++------
 1 file changed, 79 insertions(+), 26 deletions(-)

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2.53.0