Re: [PATCH] KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic

[Christian Borntraeger]

Am 15.04.26 um 11:26 schrieb Junrui Luo:
> kvm_s390_pci_aif_enable(), kvm_s390_pci_aif_disable(), and
> aen_host_forward() index the GAIT by manually multiplying the index
> with sizeof(struct zpci_gaite).
>
> Since aift->gait is already a struct zpci_gaite pointer, this
> double-scales the offset, accessing element aisb*16 instead of aisb.
>
> This causes out-of-bounds accesses when aisb >= 32 (with
> ZPCI_NR_DEVICES=512)
>
> Fix by removing the erroneous sizeof multiplication.
>
> Fixes: 3c5a1b6f0a18 ("KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding")
> Fixes: 73f91b004321 ("KVM: s390: pci: enable host forwarding of Adapter Event Notifications")
> Reported-by: Yuhao Jiang <danisjiang@xxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Junrui Luo <moonafterrain@xxxxxxxxxxx>

thanks, applied.