linux-kernel - Re: [syzbot] [rdma?] KASAN: slab-use-after-free Read in ucma_create

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Message-ID: <tencent_1483A44448B76A9774E6C953790367296005@qq.com>
Date: Wed,  9 Jul 2025 10:22:09 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+a6ffe86390c8a6afc818@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [rdma?] KASAN: slab-use-after-free Read in ucma_create_uevent

#syz test

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 6e700b974033..762c96d5d9e2 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1506,8 +1506,8 @@ static ssize_t ucma_process_join(struct ucma_file *file,
 	mutex_lock(&ctx->mutex);
 	rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
 	mutex_unlock(&ctx->mutex);
-	ucma_cleanup_mc_events(mc);
 err_xa_erase:
+	ucma_cleanup_mc_events(mc);
 	xa_lock(&multicast_table);
 	list_del(&mc->list);
 	__xa_erase(&multicast_table, mc->id);