linux-kernel - [PATCH 3.16 027/366] staging: rtl8192u: return -ENOMEM on failed allocation of priv->oldaddr

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Message-ID: <lsq.1539530740.576257878@decadent.org.uk>
Date:   Sun, 14 Oct 2018 16:25:40 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Colin Ian King" <colin.king@...onical.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.16 027/366] staging: rtl8192u: return -ENOMEM on failed
 allocation of priv->oldaddr

3.16.60-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@...onical.com>

commit e1a7418529e33bc4efc346324557251a16a3e79b upstream.

Currently the allocation of priv->oldaddr is not null checked which will
lead to subsequent errors when accessing priv->oldaddr.  Fix this with
a null pointer check and a return of -ENOMEM on allocation failure.

Detected with Coccinelle:
drivers/staging/rtl8192u/r8192U_core.c:1708:2-15: alloc with no test,
possible model on line 1723

Fixes: 8fc8598e61f6 ("Staging: Added Realtek rtl8192u driver to staging")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/rtl8192u/r8192U_core.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/staging/rtl8192u/r8192U_core.c
+++ b/drivers/staging/rtl8192u/r8192U_core.c
@@ -1893,6 +1893,8 @@ static short rtl8192_usb_initendpoints(s
 
 		priv->rx_urb[16] = usb_alloc_urb(0, GFP_KERNEL);
 		priv->oldaddr = kmalloc(16, GFP_KERNEL);
+		if (!priv->oldaddr)
+			return -ENOMEM;
 		oldaddr = priv->oldaddr;
 		align = ((long)oldaddr) & 3;
 		if (align) {