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nfc: fdp: fix NULL pointer dereference

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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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudip Mukherjee 2016-12-20 21:09:04 +00:00 committed by Greg Kroah-Hartman
parent 56548b6f50
commit 8335b312c7
1 changed files with 3 additions and 3 deletions
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6
drivers/nfc/fdp/i2c.c
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@ -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)