pinctrl: ralink: Check for null return of devm_kcalloc

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: pinctrl: ralink: Check for null return of devm_kcalloc Because of the possible failure of the allocation, data->domains might be NULL pointer and will cause the dereference of the NULL pointer later. Therefore, it might be better to check it and directly return -ENOMEM without releasing data manually if fails, because the comment of the devm_kmalloc() says "Memory allocated with this function is automatically freed on driver detach.".

References

• https://git.kernel.org/stable/c/13596e6c9e541e90e5fc2c52b23f08b951370da9
• https://git.kernel.org/stable/c/6194c021496addc11763d1ffa89ce5751889fe3c
• https://git.kernel.org/stable/c/5694b162f275fb9a9f89422701b2b963be11e496
• https://git.kernel.org/stable/c/44016a85419ca0d4f1e4d0127b330f8e4e2a57d0
• https://git.kernel.org/stable/c/5595d30c4dc27d939635c3188c68203b6ece1711
• https://git.kernel.org/stable/c/c3b821e8e406d5650e587b7ac624ac24e9b780a8