From: Cédric Le Goater clg@kaod.org
commit 9798f4ea71eaf8eaad7e688c5b298528089c7bf8 upstream.
The XIVE device structure is now allocated in kvmppc_xive_get_device() and kfree'd in kvmppc_core_destroy_vm(). In case of an OPAL error when allocating the XIVE VPs, the kfree() call in kvmppc_xive_*create() will result in a double free and corrupt the host memory.
Fixes: 5422e95103cf ("KVM: PPC: Book3S HV: XIVE: Replace the 'destroy' method by a 'release' method") Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Cédric Le Goater clg@kaod.org Tested-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/6ea6998b-a890-2511-01d1-747d7621eb19@kaod.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/kvm/book3s_xive.c | 4 +--- arch/powerpc/kvm/book3s_xive_native.c | 4 ++-- 2 files changed, 3 insertions(+), 5 deletions(-)
--- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -1986,10 +1986,8 @@ static int kvmppc_xive_create(struct kvm
xive->single_escalation = xive_native_has_single_escalation();
- if (ret) { - kfree(xive); + if (ret) return ret; - }
return 0; } --- a/arch/powerpc/kvm/book3s_xive_native.c +++ b/arch/powerpc/kvm/book3s_xive_native.c @@ -1090,9 +1090,9 @@ static int kvmppc_xive_native_create(str xive->ops = &kvmppc_xive_native_ops;
if (ret) - kfree(xive); + return ret;
- return ret; + return 0; }
/*