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net: qrtr: ns: Change nodes radix tree to xarray 

There is a use after free scenario while iterating through the nodes
radix tree despite the ns being a single threaded process. This can
happen when the radix tree APIs are not synchronized with the
rcu_read_lock() APIs.

Convert the radix tree for nodes to xarray to take advantage of the
built in rcu lock usage provided by xarray.

Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Signed-off-by: Vignesh Viswanathan <quic_viswanat@quicinc.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vignesh Viswanathan 2023-07-14 11:28:45 +05:30 committed by David S. Miller
parent 608a147a88
commit f26b32ef2f
1 changed files with 3 additions and 3 deletions
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6
net/qrtr/ns.c
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@ -16,7 +16,7 @@
#define CREATE_TRACE_POINTS
#include <trace/events/qrtr.h>
static RADIX_TREE(nodes, GFP_KERNEL);
static DEFINE_XARRAY(nodes);
static struct {
struct socket *sock;
@ -73,7 +73,7 @@ static struct qrtr_node *node_get(unsigned int node_id)
{
struct qrtr_node *node;
node = radix_tree_lookup(&nodes, node_id);
node = xa_load(&nodes, node_id);
if (node)
return node;
@ -85,7 +85,7 @@ static struct qrtr_node *node_get(unsigned int node_id)
node->id = node_id;
xa_init(&node->servers);
if (radix_tree_insert(&nodes, node_id, node)) {
if (xa_store(&nodes, node_id, node, GFP_KERNEL)) {
kfree(node);
return NULL;
}