From: Martijn Coenen <maco@android.com>
Date: Fri, 28 Jul 2017 11:56:08 +0000 (+0200)
Subject: ANDROID: binder: fix proc->tsk check.
X-Git-Tag: v4.4.85~14
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9dac44d5d4b0a7fffe04ad505e0a082e900ad767;p=thirdparty%2Fkernel%2Fstable.git

ANDROID: binder: fix proc->tsk check.

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>
---

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 74da4821b8d68..5531f020e5612 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2869,7 +2869,7 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
 	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)