In the Linux kernel, the following vulnerability has been resolved:
gpiolib: Fix potential NULL pointer dereference in gpiodgetlabel()
In gpiod_get_label()
, it is possible that srcu_dereference_check()
may
return a NULL pointer, leading to a scenario where label->str
is accessed
without verifying if label
itself is NULL.
This patch adds a proper NULL check for label
before accessing
label->str
. The check for label->str != NULL
is removed because
label->str
can never be NULL if label
is not NULL.
This fixes the issue where the label name was being printed as (efault)
when dumping the sysfs GPIO file when label == NULL
.