linux-kernel - Re: [syzbot] [arm-msm?] [net?] memory leak in radix_tree

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Date:   Sat, 09 Dec 2023 19:52:19 -0800
From:   syzbot <syzbot+006987d1be3586e13555@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [arm-msm?] [net?] memory leak in radix_tree_insert

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Subject: [arm-msm?] [net?] memory leak in radix_tree_insert
Author: eadavis@...com

please test memory leak in radix_tree_insert

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 33cc938e65a9

diff --git a/net/qrtr/af_qrtr.c b/net/qrtr/af_qrtr.c
index 41ece61eb57a..4946a14b819d 100644
--- a/net/qrtr/af_qrtr.c
+++ b/net/qrtr/af_qrtr.c
@@ -273,11 +273,17 @@ static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port,
 	if (!flow) {
 		flow = kzalloc(sizeof(*flow), GFP_KERNEL);
 		if (flow) {
+			if (radix_tree_preload(GFP_KERNEL)) {
+				mutex_unlock(&node->qrtr_tx_lock);
+				return -ENOMEM;
+			}
 			init_waitqueue_head(&flow->resume_tx);
-			if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
+			if (ret = radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
+				printk("r: %d\n", ret);
 				kfree(flow);
 				flow = NULL;
 			}
+			radix_tree_preload_end();
 		}
 	}
 	mutex_unlock(&node->qrtr_tx_lock);