[PATCH 4.12 87/99] ANDROID: binder: fix proc->tsk check.

Greg Kroah-Hartman
2017-08-28T09:05:08Z

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
@@ -3362,7 +3362,7 @@ 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)