hw/block/nvme: assert namespaces array indices

Coverity complains about a possible memory corruption in the
nvme_ns_attach and _detach functions. While we should not (famous last
words) be able to reach this function without nsid having previously
been validated, this is still an open door for future misuse.

Make Coverity and maintainers happy by asserting that the index into the
array is valid. Also, while not detected by Coverity (yet), add an
assert in nvme_subsys_ns and nvme_subsys_register_ns as well since a
similar issue is exists there.

Fixes: 037953b5 ("hw/block/nvme: support namespace detach")
Fixes: CID 1450757
Fixes: CID 1450758
Cc: Minwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: NKlaus Jensen <k.jensen@samsung.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>

hw/block/nvme-subsys.c

@@ -47,15 +47,18 @@ int nvme_subsys_register_ns(NvmeNamespace *ns, Error **errp)
 {
     NvmeSubsystem *subsys = ns->subsys;
     NvmeCtrl *n;
+    uint32_t nsid = nvme_nsid(ns);
     int i;
 
-    if (subsys->namespaces[nvme_nsid(ns)]) {
+    assert(nsid && nsid <= NVME_SUBSYS_MAX_NAMESPACES);
+
+    if (subsys->namespaces[nsid]) {
         error_setg(errp, "namespace %d already registerd to subsy %s",
                    nvme_nsid(ns), subsys->parent_obj.id);
         return -1;
     }
 
-    subsys->namespaces[nvme_nsid(ns)] = ns;
+    subsys->namespaces[nsid] = ns;
 
     for (i = 0; i < ARRAY_SIZE(subsys->ctrls); i++) {
         n = subsys->ctrls[i];

hw/block/nvme-subsys.h

@@ -54,6 +54,8 @@ static inline NvmeNamespace *nvme_subsys_ns(NvmeSubsystem *subsys,
         return NULL;
     }
 
+    assert(nsid && nsid <= NVME_SUBSYS_MAX_NAMESPACES);
+
     return subsys->namespaces[nsid];
 }
 

hw/block/nvme.h

@@ -236,12 +236,18 @@ static inline bool nvme_ns_is_attached(NvmeCtrl *n, NvmeNamespace *ns)
 
 static inline void nvme_ns_attach(NvmeCtrl *n, NvmeNamespace *ns)
 {
-    n->namespaces[nvme_nsid(ns) - 1] = ns;
+    uint32_t nsid = nvme_nsid(ns);
+    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
+
+    n->namespaces[nsid - 1] = ns;
 }
 
 static inline void nvme_ns_detach(NvmeCtrl *n, NvmeNamespace *ns)
 {
-    n->namespaces[nvme_nsid(ns) - 1] = NULL;
+    uint32_t nsid = nvme_nsid(ns);
+    assert(nsid && nsid <= NVME_MAX_NAMESPACES);
+
+    n->namespaces[nsid - 1] = NULL;
 }
 
 static inline NvmeCQueue *nvme_cq(NvmeRequest *req)