Cc'ed to Linux PCI ML in case somebody has better knowledge about. On Fri, Jan 10, 2020 at 1:54 PM P J P <ppandit@xxxxxxxxxx> wrote: > > Hello Andy, Navid > > -> https://git.kernel.org/linus/ea5ab2e422de0ef0fc476fe40f0829abe72684cd > > I was trying to understand this NULL dereference. IIUC, pci_ioremap_bar() > returning NULL indicates insufficient memory OR if the pci device is > configured to use I/O port address, instead of memory mapped region. > > I was wondering if(or how) it is reproducible for unprivileged user? Do you > happen to have a reproducer for it? It's very unlikely to see IRL such problem. Theoretically it may happen if the system in question has a LOT of devices connected to PCI and suddenly there is no window for a resource left (usually 4k) under PCI Root Bridge. Other than that I can't imagine what can go wrong. Ah, of course the virtual space starvation is another possibility. -- With Best Regards, Andy Shevchenko
