linux-kernel - [PATCH 3.2 023/106] of: fdt: add missing allocation-failure check

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Date:   Sat, 09 Sep 2017 22:47:39 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Johan Hovold" <johan@...nel.org>,
        "Rob Herring" <robh@...nel.org>
Subject: [PATCH 3.2 023/106] of: fdt: add missing allocation-failure check

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

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

From: Johan Hovold <johan@...nel.org>

commit 49e67dd17649b60b4d54966e18ec9c80198227f0 upstream.

The memory allocator passed to __unflatten_device_tree() (e.g. a wrapped
kzalloc) can fail so add the missing sanity check to avoid dereferencing
a NULL pointer.

Fixes: fe14042358fa ("of/flattree: Refactor unflatten_device_tree and add fdt_unflatten_tree")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Rob Herring <robh@...nel.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -388,6 +388,8 @@ static void __unflatten_device_tree(stru
 	/* Allocate memory for the expanded device tree */
 	mem = (unsigned long)
 		dt_alloc(size + 4, __alignof__(struct device_node));
+	if (!mem)
+		return NULL;
 
 	memset((void *)mem, 0, size);