From: Heyi Guo Date: Tue, 27 Aug 2019 11:26:50 +0000 (+0100) Subject: KVM: arm/arm64: vgic: Fix potential deadlock when ap_list is long X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=aafa2889b8fa98670e83d5f054e34ee1cbb44e96;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git KVM: arm/arm64: vgic: Fix potential deadlock when ap_list is long [ Upstream commit d4a8061a7c5f7c27a2dc002ee4cb89b3e6637e44 ] If the ap_list is longer than 256 entries, merge_final() in list_sort() will call the comparison callback with the same element twice, causing a deadlock in vgic_irq_cmp(). Fix it by returning early when irqa == irqb. Cc: stable@vger.kernel.org # 4.7+ Fixes: 8e4447457965 ("KVM: arm/arm64: vgic-new: Add IRQ sorting") Signed-off-by: Zenghui Yu Signed-off-by: Heyi Guo [maz: massaged commit log and patch, added Fixes and Cc-stable] Signed-off-by: Marc Zyngier Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index 9d4e01f10949..07ee8e4e00a2 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -199,6 +199,13 @@ static int vgic_irq_cmp(void *priv, struct list_head *a, struct list_head *b) bool penda, pendb; int ret; + /* + * list_sort may call this function with the same element when + * the list is fairly long. + */ + if (unlikely(irqa == irqb)) + return 0; + spin_lock(&irqa->irq_lock); spin_lock_nested(&irqb->irq_lock, SINGLE_DEPTH_NESTING);