linux-kernel - [PATCH] ibmvnic: fix: NULL pointer dereference.

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Date:   Wed, 30 Dec 2020 15:23:14 +0800
From:   YANG LI <abaci-bugfix@...ux.alibaba.com>
To:     davem@...emloft.net
Cc:     kuba@...nel.org, drt@...ux.ibm.com, ljp@...ux.ibm.com,
        sukadev@...ux.ibm.com, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        YANG LI <abaci-bugfix@...ux.alibaba.com>
Subject: [PATCH] ibmvnic: fix: NULL pointer dereference.

The error is due to dereference a null pointer in function
reset_one_sub_crq_queue():

if (!scrq) {
    netdev_dbg(adapter->netdev,
               "Invalid scrq reset. irq (%d) or msgs(%p).\n",
		scrq->irq, scrq->msgs);
		return -EINVAL;
}

If the expression is true, scrq must be a null pointer and cannot
dereference.

Signed-off-by: YANG LI <abaci-bugfix@...ux.alibaba.com>
Reported-by: Abaci <abaci@...ux.alibaba.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index f302504..d7472be 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2981,9 +2981,7 @@ static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
 	int rc;
 
 	if (!scrq) {
-		netdev_dbg(adapter->netdev,
-			   "Invalid scrq reset. irq (%d) or msgs (%p).\n",
-			   scrq->irq, scrq->msgs);
+		netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
 		return -EINVAL;
 	}
 
-- 
1.8.3.1