PCI: keystone: Fix NULL pointer dereference in case of DT error in ks_pcie_setup_rc_app_regs()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: PCI: keystone: Fix NULL pointer dereference in case of DT error in ks_pcie_setup_rc_app_regs() If IORESOURCE_MEM is not provided in Device Tree due to any error, resource_list_first_type() will return NULL and pci_parse_request_of_pci_ranges() will just emit a warning. This will cause a NULL pointer dereference. Fix this bug by adding NULL return check. Found by Linux Verification Center (linuxtesting.org) with SVACE.

References

• https://git.kernel.org/stable/c/bbba48ad67c53feea05936ea1e029dcca8057506
• https://git.kernel.org/stable/c/0a6f1b5fe8ef8268aaa069035639968ceeea0a23
• https://git.kernel.org/stable/c/dbcdd1863ba2ec9b76ec131df25d797709e05597
• https://git.kernel.org/stable/c/a231707a91f323af1e5d9f1722055ec2fc1c7775