linux-kernel - [PATCH 4.4 40/53] ANDROID: binder: fix proc->tsk check.

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Message-Id: <20170828080519.454421415@linuxfoundation.org>
Date:   Mon, 28 Aug 2017 10:05:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Martijn Coenen <maco@...roid.com>,
        John Stultz <john.stultz@...aro.org>
Subject: [PATCH 4.4 40/53] ANDROID: binder: fix proc->tsk check.

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Martijn Coenen <maco@...roid.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@...roid.com>
Tested-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2869,7 +2869,7 @@ 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)