Patch "MIPS: kexec: Do not reserve invalid crashkernel memory on boot" has been added to the 4.9-stable tree

Patch "MIPS: kexec: Do not reserve invalid crashkernel memory on boot" has been added to the 4.9-stable tree

[gregkh]

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

    MIPS: kexec: Do not reserve invalid crashkernel memory on boot

to the 4.9-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-kexec-do-not-reserve-invalid-crashkernel-memory-on-boot.patch
and it can be found in the queue-4.9 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 foo@baz Thu Oct  5 10:28:31 CEST 2017
From: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Date: Wed, 23 Nov 2016 14:43:50 +0100
Subject: MIPS: kexec: Do not reserve invalid crashkernel memory on boot

From: Marcin Nowakowski <marcin.nowakowski@imgtec.com>


[ Upstream commit a8f108d70c74d83574c157648383eb2e4285a190 ]

Do not reserve memory for the crashkernel if the commandline argument
points to a wrong location. This can happen if the location is specified
wrong or if the same commandline is reused when starting the crashkernel
- in the latter case the reserved memory would point to the location
from which the crashkernel is executing.

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14612/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/mips/kernel/setup.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -668,6 +668,11 @@ static void __init mips_parse_crashkerne
 	if (ret != 0 || crash_size <= 0)
 		return;
 
+	if (!memory_region_available(crash_base, crash_size)) {
+		pr_warn("Invalid memory region reserved for crash kernel\n");
+		return;
+	}
+
 	crashk_res.start = crash_base;
 	crashk_res.end	 = crash_base + crash_size - 1;
 }


Patches currently in stable-queue which might be from marcin.nowakowski@imgtec.com are

queue-4.9/mips-irq-stack-unwind-irq-stack-onto-task-stack.patch
queue-4.9/mips-fix-mem-x-y-commandline-processing.patch
queue-4.9/mips-kexec-do-not-reserve-invalid-crashkernel-memory-on-boot.patch