From: Akihiko Odaki <akihiko.odaki@daynix.com>
Date: Wed, 28 Feb 2024 11:33:13 +0000 (+0900)
Subject: pcie_sriov: Validate NumVFs
X-Git-Tag: v7.2.11~39
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=309051ac4028547d8d7647262e79d16c667976fe;p=thirdparty%2Fqemu.git

pcie_sriov: Validate NumVFs

The guest may write NumVFs greater than TotalVFs and that can lead
to buffer overflow in VF implementations.

Cc: qemu-stable@nongnu.org
Fixes: CVE-2024-26327
Fixes: 7c0fa8dff811 ("pcie: Add support for Single Root I/O Virtualization (SR/IOV)")
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20240228-reuse-v8-2-282660281e60@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Sriram Yagnaraman <sriram.yagnaraman@ericsson.com>
(cherry picked from commit 6081b4243cd64dff1b2cf5b0c215c71e9d7e753b)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
---

diff --git a/hw/pci/pcie_sriov.c b/hw/pci/pcie_sriov.c
index 3703d250f0f..0d58e4db433 100644
--- a/hw/pci/pcie_sriov.c
+++ b/hw/pci/pcie_sriov.c
@@ -176,6 +176,9 @@ static void register_vfs(PCIDevice *dev)
 
     assert(sriov_cap > 0);
     num_vfs = pci_get_word(dev->config + sriov_cap + PCI_SRIOV_NUM_VF);
+    if (num_vfs > pci_get_word(dev->config + sriov_cap + PCI_SRIOV_TOTAL_VF)) {
+        return;
+    }
 
     dev->exp.sriov_pf.vf = g_new(PCIDevice *, num_vfs);