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Date: Thu, 25 Jul 2019 20:15:08 +0800
From: Jia-Ju Bai <baijiaju1990@...il.com>
To: bharat@...lsio.com, dledford@...hat.com, jgg@...pe.ca
Cc: linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] infiniband: hw: cxgb3: Fix a possible null-pointer dereference in connect_reply_upcall()
In connect_reply_upcall(), there is an if statement on line 730 to check
whether ep->com.cm_id is NULL:
if (ep->com.cm_id)
When ep->com.cm_id is NULL, it is used on line 736:
ep->com.cm_id->rem_ref(ep->com.cm_id);
Thus, a possible null-pointer dereference may occur.
To fix this bug, ep->com.cm_id is checked before being used.
This bug is found by a static analysis tool STCheck written by us.
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
drivers/infiniband/hw/cxgb3/iwch_cm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/cxgb3/iwch_cm.c b/drivers/infiniband/hw/cxgb3/iwch_cm.c
index 0bca72cb4d9a..2b31c4726d3e 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_cm.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_cm.c
@@ -733,7 +733,8 @@ static void connect_reply_upcall(struct iwch_ep *ep, int status)
ep->com.cm_id->event_handler(ep->com.cm_id, &event);
}
if (status < 0) {
- ep->com.cm_id->rem_ref(ep->com.cm_id);
+ if (ep->com.cm_id)
+ ep->com.cm_id->rem_ref(ep->com.cm_id);
ep->com.cm_id = NULL;
ep->com.qp = NULL;
}
--
2.17.0
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