memory leak in dma_buf_ioctl

[syzbot]

syzbot has bisected this bug to:

commit 04cf31a759ef575f750a63777cee95500e410994
Author: Michael Ellerman <mpe at ellerman.id.au>
Date:   Thu Mar 24 11:04:01 2016 +0000

     ftrace: Make ftrace_location_range() global

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=154293f4600000
start commit:   abdfd52a Merge tag 'armsoc-defconfig' of git://git.kernel...
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=174293f4600000
console output: https://syzkaller.appspot.com/x/log.txt?x=134293f4600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d31de3d88059b7fa
dashboard link: https://syzkaller.appspot.com/bug?extid=b2098bc44728a4efb3e9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12526e58600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161784f0600000

Reported-by: syzbot+b2098bc44728a4efb3e9 at syzkaller.appspotmail.com
Fixes: 04cf31a759ef ("ftrace: Make ftrace_location_range() global")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection