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Tsirkin" , qemu-stable@nongnu.org Subject: [PATCH] hw/virtio/virtio-iommu: Reject inverted MAP range Date: Mon, 3 Aug 2026 17:43:02 +0800 Message-ID: <20260803094302.95228-1-guobin@linux.alibaba.com> X-Mailer: git-send-email 2.50.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Host-Lookup-Failed: Reverse DNS lookup failed for 115.124.30.98 (deferred) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=115.124.30.98; envelope-from=guobin@linux.alibaba.com; helo=out30-98.freemail.mail.aliyun.com X-Spam_score_int: -166 X-Spam_score: -16.7 X-Spam_bar: ---------------- X-Spam_report: (-16.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_PASS=-0.001, T_SPF_HELO_TEMPERROR=0.01, UNPARSEABLE_RELAY=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linux.alibaba.com) X-ZM-MESSAGEID: 1785750264083158500 Content-Type: text/plain; charset="utf-8" virtio_iommu_map() did not check that virt_end >=3D virt_start. An inverted range corrupts the GTree comparator contract (interval_cmp returns non-zero for a key compared with itself), causing an infinite loop in virtio_iommu_unmap() while holding s->mutex. Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/4104 Cc: qemu-stable@nongnu.org Signed-off-by: Bin Guo --- hw/virtio/virtio-iommu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index 533bd5073f..cc863e90d2 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -807,6 +807,10 @@ static int virtio_iommu_map(VirtIOIOMMU *s, return VIRTIO_IOMMU_S_INVAL; } =20 + if (virt_end < virt_start) { + return VIRTIO_IOMMU_S_INVAL; + } + domain =3D g_tree_lookup(s->domains, GUINT_TO_POINTER(domain_id)); if (!domain) { return VIRTIO_IOMMU_S_NOENT; --=20 2.50.1 (Apple Git-155)