netdev - [PATCH net v3 1/2] e100: Fix a null pointer deference in e100

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Message-Id: <1419472956-6270-1-git-send-email-baijiaju1990@163.com>
Date:	Thu, 25 Dec 2014 10:02:35 +0800
From:	Jia-Ju Bai <baijiaju1990@....com>
To:	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
	bruce.w.allan@...el.com, carolyn.wyborny@...el.com,
	donald.c.skidmore@...el.com, gregory.v.rose@...el.com,
	matthew.vick@...el.com, john.ronciak@...el.com,
	mitch.a.williams@...el.com
Cc:	linux.nics@...el.com, e1000-devel@...ts.sourceforge.net,
	netdev@...r.kernel.org, Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH net v3 1/2] e100: Fix a null pointer deference in e100_probe

The driver lacks the check of nic->cbs_pool after pci_pool_create
in e100_probe. So when this function is failed, the null pointer
dereference occurs when pci_pool_alloc uses nic->cbs_pool in e100_alloc_cbs.
This patch fixes this problem, and it has been tested on the hardware.

Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>
---
 drivers/net/ethernet/intel/e100.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c
index 781065e..ba1813f 100644
--- a/drivers/net/ethernet/intel/e100.c
+++ b/drivers/net/ethernet/intel/e100.c
@@ -2969,6 +2969,10 @@ static int e100_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			   nic->params.cbs.max * sizeof(struct cb),
 			   sizeof(u32),
 			   0);
+	if (!nic->cbs_pool) {
+		err = -ENOMEM;
+		goto err_out_pool;
+	}
 	netif_info(nic, probe, nic->netdev,
 		   "addr 0x%llx, irq %d, MAC addr %pM\n",
 		   (unsigned long long)pci_resource_start(pdev, use_io ? 1 : 0),
@@ -2976,6 +2980,8 @@ static int e100_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	return 0;
 
+err_out_pool:
+	unregister_netdev(netdev);
 err_out_free:
 	e100_free(nic);
 err_out_iounmap:
-- 
1.7.9.5


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