CVE-2024-50070

In the Linux kernel, the following vulnerability has been resolved:

pinctrl: stm32: check devm_kasprintf() returned value

devm_kasprintf() can return a NULL pointer on failure but this returned
value is not checked. Fix this lack and check the returned value.

Found by code review.

More information : https://git.kernel.org/stable/c/1f266957ae1207b0717c2d69096bc70654ae9fcb