Patch "MIPS: KASLR: Fix handling of NULL FDT" has been added to the 4.8-stable tree

Patch "MIPS: KASLR: Fix handling of NULL FDT" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    MIPS: KASLR: Fix handling of NULL FDT

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mips-kaslr-fix-handling-of-null-fdt.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4736697963385e6257ee8e260e97347e858cd962 Mon Sep 17 00:00:00 2001
From: Matt Redfearn <matt.redfearn@imgtec.com>
Date: Mon, 17 Oct 2016 17:21:46 +0100
Subject: MIPS: KASLR: Fix handling of NULL FDT

From: Matt Redfearn <matt.redfearn@imgtec.com>

commit 4736697963385e6257ee8e260e97347e858cd962 upstream.

If platform code returns a NULL pointer to the FDT, initial_boot_params
will not get set to a valid pointer and attempting to find the /chosen
node in it will cause a NULL pointer dereference and the kernel to crash
immediately on startup - with no output to the console.

Fix this by checking that initial_boot_params is valid before using it.

Fixes: 405bc8fd12f5 ("MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE")
Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14414/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/mips/kernel/relocate.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/kernel/relocate.c
+++ b/arch/mips/kernel/relocate.c
@@ -200,7 +200,7 @@ static inline __init unsigned long get_r
 
 #if defined(CONFIG_USE_OF)
 	/* Get any additional entropy passed in device tree */
-	{
+	if (initial_boot_params) {
 		int node, len;
 		u64 *prop;
 


Patches currently in stable-queue which might be from matt.redfearn@imgtec.com are

queue-4.8/virtio-console-unlock-vqs-while-freeing-buffers.patch
queue-4.8/mips-kaslr-fix-handling-of-null-fdt.patch