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[for-4.4,06/13] nfc: fdp: fix NULL pointer dereference

Message ID 1501013241-31961-7-git-send-email-amit.pundir@linaro.org
State New
Headers show
Series Stable candidates for 4.4.y | expand

Commit Message

Amit Pundir July 25, 2017, 8:07 p.m. UTC 
From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>


commit b6355fb3f5f40bbce165847d277e64896cab8f95 upstream.

We are checking phy after dereferencing it. We can print the debug
information after checking it. If phy is NULL then we will get a good
stack trace to tell us that we are in this irq handler.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>

---
 drivers/nfc/fdp/i2c.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
2.7.4
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Patch

diff --git a/drivers/nfc/fdp/i2c.c b/drivers/nfc/fdp/i2c.c
index 532db28145c7..a5d7332dfce5 100644
--- a/drivers/nfc/fdp/i2c.c
+++ b/drivers/nfc/fdp/i2c.c
@@ -210,14 +210,14 @@  static irqreturn_t fdp_nci_i2c_irq_thread_fn(int irq, void *phy_id)
 	struct sk_buff *skb;
 	int r;
 
-	client = phy->i2c_dev;
-	dev_dbg(&client->dev, "%s\n", __func__);
-
 	if (!phy || irq != phy->i2c_dev->irq) {
 		WARN_ON_ONCE(1);
 		return IRQ_NONE;
 	}
 
+	client = phy->i2c_dev;
+	dev_dbg(&client->dev, "%s\n", __func__);
+
 	r = fdp_nci_i2c_read(phy, &skb);
 
 	if (r == -EREMOTEIO)