host_memory_backend_set_host_nodes() was not validating host-nodes before writing to backend->host_nodes, making QEMU write beyond the end of the bitmap.
Fix the crash and add a simple regression test for the fix. While at it, fix memory leak of the list returned by visit_type_uint16List(). Reported-by: Markus Armbruster <[email protected]> Signed-off-by: Eduardo Habkost <[email protected]> Message-Id: <[email protected]> Reviewed-by: Stefano Garzarella <[email protected]> Reviewed-by: David Hildenbrand <[email protected]> Reviewed-by: Igor Mammedov <[email protected]> [ehabkost: removed test case code] Signed-off-by: Eduardo Habkost <[email protected]> --- backends/hostmem.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/backends/hostmem.c b/backends/hostmem.c index 1a89342039..af800284e0 100644 --- a/backends/hostmem.c +++ b/backends/hostmem.c @@ -103,14 +103,23 @@ host_memory_backend_set_host_nodes(Object *obj, Visitor *v, const char *name, { #ifdef CONFIG_NUMA HostMemoryBackend *backend = MEMORY_BACKEND(obj); - uint16List *l = NULL; + uint16List *l, *host_nodes = NULL; - visit_type_uint16List(v, name, &l, errp); + visit_type_uint16List(v, name, &host_nodes, errp); - while (l) { + for (l = host_nodes; l; l = l->next) { + if (l->value >= MAX_NODES) { + error_setg(errp, "Invalid host-nodes value: %d", l->value); + goto out; + } + } + + for (l = host_nodes; l; l = l->next) { bitmap_set(backend->host_nodes, l->value, 1); - l = l->next; } + +out: + qapi_free_uint16List(host_nodes); #else error_setg(errp, "NUMA node binding are not supported by this QEMU"); #endif -- 2.18.0.rc1.1.g3f1ff2140
