From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 188DD424D4A; Thu, 16 Jul 2026 14:17:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784211439; cv=none; b=DQLOePSFAHanP4wMuNRPGD26YI2FWp6NRwBB4NYFvDgNKooDdAt+DpknuOIhjGvK5oJAr3TKCq7C75AGOdfCGm9HxBJqpUWAfJVyTLngpQ5FmWpc8VXXE6FiQSiPeEP3nD4WQM6wwISwQ9k7ifCcWX1Nd30CU+kD9NjGHUHET1A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784211439; c=relaxed/simple; bh=kOCGLIP636GvK2XZQY1St0v6xRwZVEn4uJ7HV75ee6c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Drshi3MgVw3EytKLljSl1ade+dkyh0b+cZND2xtvFUb7FIFzOrEpHxB6FZsPdWNmc5GzJnFy5TvEYJt3F3TCBnpqi5uzOA/jMnlQNprOQ3Zkr0Jd+Gma5yQu3fDSnYNXiracZHSWoIdeGPEseR2mjg55IVevVMwz/PmzdghWcXU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=FB+g+56k; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="FB+g+56k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 73EB31F000E9; Thu, 16 Jul 2026 14:17:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784211438; bh=y0dKhK9y4qr3+M21Cu7EnZrAmCop9Sr2HR4k4B5qfBI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=FB+g+56kXSajpTTNmjyK+M4cXjcKOjwMKD05sms3dlOEL2Ci7+laESC7xo78JS2sl arSDsIhydcX2xf0rB5GxAlDvVXdgVbRxGl+PsOwgEwkJZhGg+07jDYpzVzuND++Kcz T7y0Q1x3+mVWez/P8aEKMzMopULNi3VuA/8m/EaM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Oliver Upton , Marc Zyngier Subject: [PATCH 6.18 429/480] KVM: arm64: Dont leak PFN when kvm_translate_vncr() races MMU notifier Date: Thu, 16 Jul 2026 15:32:56 +0200 Message-ID: <20260716133054.095648779@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133044.672218725@linuxfoundation.org> References: <20260716133044.672218725@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Oliver Upton commit 9f76b039a72d7e06374aa96862f0232ed53f7787 upstream. In the case that kvm_translate_vncr() races with an MMU notifier the early return does not release a reference on the faulted in PFN. Add the necessary call to kvm_release_faultin_page() for the unused PFN. Cc: stable@vger.kernel.org Fixes: 069a05e535496 ("KVM: arm64: nv: Handle VNCR_EL2-triggered faults") Reported-by: Sashiko (local):gemini-3.1-pro Signed-off-by: Oliver Upton Link: https://patch.msgid.link/20260602235450.103057-2-oupton@kernel.org Signed-off-by: Marc Zyngier Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kvm/nested.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -1238,8 +1238,10 @@ static int kvm_translate_vncr(struct kvm } scoped_guard(write_lock, &vcpu->kvm->mmu_lock) { - if (mmu_invalidate_retry(vcpu->kvm, mmu_seq)) + if (mmu_invalidate_retry(vcpu->kvm, mmu_seq)) { + kvm_release_faultin_page(vcpu->kvm, page, true, false); return -EAGAIN; + } vt->gva = va; vt->hpa = pfn << PAGE_SHIFT;