Patch "powerpc/spufs: Fix coredump of SPU contexts" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    powerpc/spufs: Fix coredump of SPU contexts

to the 4.4-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:
     powerpc-spufs-fix-coredump-of-spu-contexts.patch
and it can be found in the queue-4.4 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 Tue Apr 10 10:31:53 CEST 2018
From: Michael Ellerman <mpe@ellerman.id.au>
Date: Mon, 29 May 2017 20:26:07 +1000
Subject: powerpc/spufs: Fix coredump of SPU contexts

From: Michael Ellerman <mpe@ellerman.id.au>


[ Upstream commit 99acc9bede06bbb2662aafff51f5b9e529fa845e ]

If a process dumps core while it has SPU contexts active then we have
code to also dump information about the SPU contexts.

Unfortunately it's been broken for 3 1/2 years, and we didn't notice. In
commit 7b1f4020d0d1 ("spufs: get rid of dump_emit() wrappers") the nread
variable was removed and rc used instead. That means when the loop exits
successfully, rc has the number of bytes read, but it's then used as the
return value for the function, which should return 0 on success.

So fix it by setting rc = 0 before returning in the success case.

Fixes: 7b1f4020d0d1 ("spufs: get rid of dump_emit() wrappers")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/powerpc/platforms/cell/spufs/coredump.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/powerpc/platforms/cell/spufs/coredump.c
+++ b/arch/powerpc/platforms/cell/spufs/coredump.c
@@ -174,6 +174,8 @@ static int spufs_arch_write_note(struct
 	if (!dump_skip(cprm,
 		       roundup(cprm->written - total + sz, 4) - cprm->written))
 		goto Eio;
+
+	rc = 0;
 out:
 	free_page((unsigned long)buf);
 	return rc;


Patches currently in stable-queue which might be from mpe@ellerman.id.au are

queue-4.4/selftests-powerpc-fix-tm-resched-dscr-test-with-some-compilers.patch
queue-4.4/powerpc-mm-fix-virt_addr_valid-etc.-on-64-bit-hash.patch
queue-4.4/powerpc-spufs-fix-coredump-of-spu-contexts.patch
queue-4.4/signal-powerpc-document-conflicts-with-si_user-and-sigfpe-and-sigtrap.patch
queue-4.4/powerpc-don-t-clobber-tcr-when-setting-tcr.patch