gpiolib: fix invalid pointer access in debugfs

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[ Upstream commit 2f6115ad88 ]

If the memory allocation in gpiolib_seq_start() fails, the s->private
field remains uninitialized and is later dereferenced without checking
in gpiolib_seq_stop(). Initialize s->private to NULL before calling
kzalloc() and check it before dereferencing it.

Fixes: e348544f79 ("gpio: protect the list of GPIO devices with SRCU")
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20251103141132.53471-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Bartosz Golaszewski 2025-11-03 15:11:32 +01:00 • committed by Greg Kroah-Hartman

parent 25decf0469

commit 3c91c8f424

1 changed files with 7 additions and 1 deletions

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drivers/gpio/gpiolib.c

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