lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20250109133817.314401-2-pbonzini@redhat.com>
Date: Thu,  9 Jan 2025 14:38:13 +0100
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Cc: oliver.upton@...ux.dev,
	Will Deacon <will@...nel.org>,
	Anup Patel <apatel@...tanamicro.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	seanjc@...gle.com,
	linuxppc-dev@...ts.ozlabs.org,
	regressions@...ts.linux.dev,
	stable@...r.kernel.org
Subject: [PATCH 1/5] KVM: e500: retry if no memslot is found

Avoid a NULL pointer dereference if the memslot table changes between the
exit and the call to kvmppc_e500_shadow_map().

Cc: stable@...r.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/powerpc/kvm/e500_mmu_host.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index e5a145b578a4..732335444d68 100644
--- a/arch/powerpc/kvm/e500_mmu_host.c
+++ b/arch/powerpc/kvm/e500_mmu_host.c
@@ -349,6 +349,11 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 	 * pointer through from the first lookup.
 	 */
 	slot = gfn_to_memslot(vcpu_e500->vcpu.kvm, gfn);
+	if (!slot) {
+		ret = -EAGAIN;
+		goto out;
+	}
+
 	hva = gfn_to_hva_memslot(slot, gfn);
 
 	if (tlbsel == 1) {
-- 
2.47.1


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ