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 <[email protected]> Signed-off-by: David S. Miller <[email protected]>
jix · Mar 4, 2019 · 38d2265 · 38d2265
1 parent 72d8b4f
commit 38d2265
Showing 1 changed file with 3 additions and 0 deletions.
diff --git 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;