Patch "ANDROID: binder: fix proc->tsk check." has been added to the 4.9-stable tree

Patch "ANDROID: binder: fix proc->tsk check." 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

    ANDROID: binder: fix proc->tsk check.

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:
     android-binder-fix-proc-tsk-check.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 b2a6d1b999a4c13e5997bb864694e77172d45250 Mon Sep 17 00:00:00 2001
From: Martijn Coenen <maco@android.com>
Date: Fri, 28 Jul 2017 13:56:08 +0200
Subject: ANDROID: binder: fix proc->tsk check.

From: Martijn Coenen <maco@android.com>

commit b2a6d1b999a4c13e5997bb864694e77172d45250 upstream.

Commit c4ea41ba195d ("binder: use group leader instead of open thread")'
was incomplete and didn't update a check in binder_mmap(), causing all
mmap() calls into the binder driver to fail.

Signed-off-by: Martijn Coenen <maco@android.com>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/android/binder.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2875,7 +2875,7 @@ static int binder_mmap(struct file *filp
 	const char *failure_string;
 	struct binder_buffer *buffer;
 
-	if (proc->tsk != current)
+	if (proc->tsk != current->group_leader)
 		return -EINVAL;
 
 	if ((vma->vm_end - vma->vm_start) > SZ_4M)


Patches currently in stable-queue which might be from maco@android.com are

queue-4.9/android-binder-fix-proc-tsk-check.patch