From: Gregory Price Date: Mon, 30 Oct 2023 04:42:39 +0000 (-0400) Subject: base/node.c: initialize the accessor list before registering X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=48b5928e18dc27e05cab3dc4c78cd8a15baaf1e5;p=linux.git base/node.c: initialize the accessor list before registering The current code registers the node as available in the node array before initializing the accessor list. This makes it so that anything which might access the accessor list as a result of allocations will cause an undefined memory access. In one example, an extension to access hmat data during interleave caused this undefined access as a result of a bulk allocation that occurs during node initialization but before the accessor list is initialized. Initialize the accessor list before making the node generally available to the global system. Fixes: 08d9dbe72b1f ("node: Link memory nodes to their compute nodes") Signed-off-by: Gregory Price Link: https://lore.kernel.org/r/20231030044239.971756-1-gregory.price@memverge.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/base/node.c b/drivers/base/node.c index 493d533f83755..4d588f4658c85 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -868,11 +868,15 @@ int __register_one_node(int nid) { int error; int cpu; + struct node *node; - node_devices[nid] = kzalloc(sizeof(struct node), GFP_KERNEL); - if (!node_devices[nid]) + node = kzalloc(sizeof(struct node), GFP_KERNEL); + if (!node) return -ENOMEM; + INIT_LIST_HEAD(&node->access_list); + node_devices[nid] = node; + error = register_node(node_devices[nid], nid); /* link cpu under this node */ @@ -881,7 +885,6 @@ int __register_one_node(int nid) register_cpu_under_node(cpu, nid); } - INIT_LIST_HEAD(&node_devices[nid]->access_list); node_init_caches(nid); return error;