linux-kernel - [PATCH] staging: rtl8192u: Check some memory allocation failure

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Date:   Fri, 22 Sep 2017 21:35:53 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     gregkh@...uxfoundation.org, singhalsimran0@...il.com,
        baoyou.xie@...aro.org, davem@...emloft.net, jarod@...hat.com,
        szekelyszilv@...il.com, elia.f.geretto@...il.com,
        gs051095@...il.com, shreeya.patel23498@...il.com,
        robsonde@...il.com, colin.king@...onical.com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] staging: rtl8192u: Check some memory allocation failure

If one of these memory allocations fail, a NULL pointer dereference will
occur later on.
Return -ENOMEM instead.

There is no need to free the resources already allocated, this is done
by the caller (i.e. 'rtl8192_usb_probe()') which calls
'rtl8192_usb_deleteendpoints()'.

The calling graph is:
rtl8192_usb_probe
  --> rtl8192_init
    --> rtl8192_usb_initendpoints

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
The error handling path in 'rtl8192_usb_probe' must also be fixed because
it is bogus. Will do that in another patch.
---
 drivers/staging/rtl8192u/r8192U_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
index 46b3f19e0878..48b7fd071900 100644
--- a/drivers/staging/rtl8192u/r8192U_core.c
+++ b/drivers/staging/rtl8192u/r8192U_core.c
@@ -1687,9 +1687,13 @@ static short rtl8192_usb_initendpoints(struct net_device *dev)
 #ifndef JACKSON_NEW_RX
 	for (i = 0; i < (MAX_RX_URB + 1); i++) {
 		priv->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
+		if (!priv->rx_urb[i])
+			return -ENOMEM;
 
 		priv->rx_urb[i]->transfer_buffer =
 			kmalloc(RX_URB_SIZE, GFP_KERNEL);
+		if (!priv->rx_urb[i]->transfer_buffer)
+			return -ENOMEM;
 
 		priv->rx_urb[i]->transfer_buffer_length = RX_URB_SIZE;
 	}
-- 
2.11.0