tree 843e54f9032b465a487485e6a4a1471e8409c03c
parent 97bf6af1f928216fd6c5a66e8a57bfa95a659672
author Michel Dänzer <michel.daenzer@amd.com> 1421657600 +0900
committer Bjorn Helgaas <bhelgaas@google.com> 1422056579 -0600

PCI: Fix infinite loop with ROM image of size 0

If the image size would ever read as 0, pci_get_rom_size() could keep
processing the same image over and over again.  Exit the loop if we ever
read a length of zero.

This fixes a soft lockup on boot when the radeon driver calls
pci_get_rom_size() on an AMD Radeon R7 250X PCIe discrete graphics card.

[bhelgaas: changelog, reference]
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1386973
Reported-by: Federico <federicotg@gmail.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org