From: Johan Hovold <johan@kernel.org>
To: Rob Herring <robh+dt@kernel.org>, Frank Rowand <frowand.list@gmail.com>
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Johan Hovold <johan@kernel.org>, stable <stable@vger.kernel.org>
Subject: [PATCH] of: fdt: add missing allocation-failure check
Date: Wed, 17 May 2017 17:29:09 +0200 [thread overview]
Message-ID: <20170517152909.13553-1-johan@kernel.org> (raw)
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")
Cc: stable <stable@vger.kernel.org> # 2.6.38
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/of/fdt.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 3080d9dd031d..43bd69dceabf 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -507,6 +507,9 @@ void *__unflatten_device_tree(const void *blob,
/* Allocate memory for the expanded device tree */
mem = dt_alloc(size + 4, __alignof__(struct device_node));
+ if (!mem)
+ return NULL;
+
memset(mem, 0, size);
*(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
--
2.13.0
next reply other threads:[~2017-05-17 15:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-17 15:29 Johan Hovold [this message]
2017-05-17 16:37 ` [PATCH] of: fdt: add missing allocation-failure check Rob Herring
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