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authorJohan Hovold <johan@kernel.org>2017-05-17 18:29:09 +0300
committerRob Herring <robh@kernel.org>2017-05-17 19:36:52 +0300
commit49e67dd17649b60b4d54966e18ec9c80198227f0 (patch)
tree91ae0cb4b14b989597251e71eed5e34c4f4e7a70 /drivers/of/fdt.c
parent828d4cdd012c8ffbf76625c3ff164312e8666784 (diff)
downloadlinux-49e67dd17649b60b4d54966e18ec9c80198227f0.tar.xz
of: fdt: add missing allocation-failure check
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> Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of/fdt.c')
-rw-r--r--drivers/of/fdt.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index a0972219ccfc..0373ae49d24d 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);