gpio: davinci: Validate the obtained number of IRQs

mainline inclusion
from mainline-v6.10-rc6
commit 7aa9b96e9a73e4ec1771492d0527bd5fc5ef9164
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAGEP8
CVE: CVE-2024-42092

Reference: http://hulk.rnd.huawei.com/patch/detail/7aa9b96e9a73e4ec1771492d0527bd5fc5ef9164



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Value of pdata->gpio_unbanked is taken from Device Tree. In case of broken
DT due to any error this value can be any. Without this value validation
there can be out of chips->irqs array boundaries access in
davinci_gpio_probe().

Validate the obtained nirq value so that it won't exceed the maximum
number of IRQs per bank.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: eb3744a2 ("gpio: davinci: Do not assume continuous IRQ numbering")
Signed-off-by: Aleksandr Mishin <amishin@t-argos.ru>
Link: https://lore.kernel.org/r/20240618144344.16943-1-amishin@t-argos.ru


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: He Yujie <coka.heyujie@huawei.com>