isdn: mISDN: Fix potential NULL pointer dereference of kzalloc

Allocating memory via kzalloc for phi may fail and causes a
NULL pointer dereference. This patch avoids such a scenario.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c
index 124ff530da82ae2edae23de0f45e57456a16eca0..26e3182bbca87a0f25b13b86fde05bb73518b292 100644 (file)
--- a/drivers/isdn/hardware/mISDN/hfcsusb.c
+++ b/drivers/isdn/hardware/mISDN/hfcsusb.c
@@ -263,6 +263,9 @@ hfcsusb_ph_info(struct hfcsusb *hw)
        int i;
 
        phi = kzalloc(struct_size(phi, bch, dch->dev.nrbchan), GFP_ATOMIC);
+       if (!phi)
+               return;
+
        phi->dch.ch.protocol = hw->protocol;
        phi->dch.ch.Flags = dch->Flags;
        phi->dch.state = dch->state;