From: Tuo Li <islituo@gmail.com>
To: ericvh@kernel.org, lucho@ionkov.net, asmadeus@codewreck.org,
linux_oss@crudebyte.com
Cc: v9fs@lists.linux.dev, linux-kernel@vger.kernel.org,
Tuo Li <islituo@gmail.com>
Subject: [PATCH] net: 9p: Fix a possible null-pointer dereference in p9_cm_event_handler()
Date: Thu, 18 Dec 2025 15:10:12 +0800 [thread overview]
Message-ID: <20251218071012.7740-1-islituo@gmail.com> (raw)
In p9_cm_event_handler(), rdma is checked in the RDMA_CM_EVENT_DISCONNECTED
case, indicating that it may be NULL. If this happens, a null-pointer
dereference can occur when complete() is called:
complete(&rdma->cm_done);
To prevent such a potential null-pointer dereference, add a defensive check
before invoking complete().
Signed-off-by: Tuo Li <islituo@gmail.com>
---
net/9p/trans_rdma.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index 4d406479f83b..b5ceae1cccbb 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -170,7 +170,8 @@ p9_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
default:
BUG();
}
- complete(&rdma->cm_done);
+ if (rdma)
+ complete(&rdma->cm_done);
return 0;
}
--
2.43.0
next reply other threads:[~2025-12-18 7:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-18 7:10 Tuo Li [this message]
2025-12-18 10:54 ` [PATCH] net: 9p: Fix a possible null-pointer dereference in p9_cm_event_handler() Christian Schoenebeck
2025-12-18 12:56 ` asmadeus
2025-12-18 13:13 ` Tuo Li
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