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[v5,2/8] KVM: arm64: vgic-v3: Fix error handling in vgic_v3_set_redist_base()

Message ID 20210404172243.504309-3-eric.auger@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM/ARM: Some vgic fixes and init sequence KVM selftests | expand

Commit Message

Auger Eric April 4, 2021, 5:22 p.m. UTC
vgic_v3_insert_redist_region() may succeed while
vgic_register_all_redist_iodevs fails. For example this happens
while adding a redistributor region overlapping a dist region. The
failure only is detected on vgic_register_all_redist_iodevs when
vgic_v3_check_base() gets called in vgic_register_redist_iodev().

In such a case, remove the newly added redistributor region and free

Signed-off-by: Eric Auger <eric.auger@redhat.com>


v1 -> v2:
- fix the commit message and split declaration/assignment of rdreg
 arch/arm64/kvm/vgic/vgic-mmio-v3.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
index ef9baf0d01b5..fec0555529c0 100644
--- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c
+++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
@@ -861,8 +861,14 @@  int vgic_v3_set_redist_base(struct kvm *kvm, u32 index, u64 addr, u32 count)
 	 * afterwards will register the iodevs when needed.
 	ret = vgic_register_all_redist_iodevs(kvm);
-	if (ret)
+	if (ret) {
+		struct vgic_redist_region *rdreg;
+		rdreg = vgic_v3_rdist_region_from_index(kvm, index);
+		list_del(&rdreg->list);
+		kfree(rdreg);
 		return ret;
+	}
 	return 0;