APPLIED[Bionic][Xenial]: [PATCH 0/1] Fix for LP: #1790480

[Kleber Souza]

On 09/05/18 12:15, Kleber Sacilotto de Souza wrote:
> BugLink: https://bugs.launchpad.net/bugs/1790480
> 
> == SRU Justification ==
> IBM is requesting a fix for the following issue found with NVMe devices on
> s390x:
> 
> The trigger is a PCI function whose driver requests more interrupts than the
> architectural maximum. Currently this is only possible with a machine that
> supports 64 CPUs (or more) with a NVMe function attached. Note that the LPAR
> does not have to use >=64 CPUs since the NVMe driver uses num_possible_cpus()
> which is resolved to the machine maximum on s390 (since all CPUs are
> hot-pluggable). The oops happens after the driver calls pci_alloc_irq_vectors
> during device probing - so most likely the system will panic during boot.
> 
> The fix has been cc'ed to stable@, but hasn't been picked up for Bionic yet.
> 
> == Fix ==
> 866f3576a72b s390/pci: fix out of bounds access during irq setup
> 
> == Regression Potential ==
> Low. Affects only s390x systems with more than 64 cpus and NVMe function
> enabled.
> 
> == Test case ==
> Boot the kernel in an affected environment.
> 
> Sebastian Ott (1):
>   s390/pci: fix out of bounds access during irq setup
> 
>  arch/s390/pci/pci.c | 2 ++
>  1 file changed, 2 insertions(+)
> 

Applied to bionic/master-next and xenial/master-next (with context
adjustment) branches.

Thanks,
Kleber