KASAN: slab-out-of-bounds Read in resample_shrink

[syzbot]

syzbot has bisected this bug to:

commit ca0214ee2802dd47239a4e39fb21c5b00ef61b22
Author: Takashi Iwai <tiwai at suse.de>
Date:   Fri Mar 22 15:00:54 2019 +0000

    ALSA: pcm: Fix possible OOB access in PCM oss plugins

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=101931fde00000
start commit:   63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=121931fde00000
console output: https://syzkaller.appspot.com/x/log.txt?x=141931fde00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5d2e033af114153f
dashboard link: https://syzkaller.appspot.com/bug?extid=e1fe9f44fb8ecf4fb5dd
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=160e2e91e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=125f09fde00000

Reported-by: syzbot+e1fe9f44fb8ecf4fb5dd at syzkaller.appspotmail.com
Fixes: ca0214ee2802 ("ALSA: pcm: Fix possible OOB access in PCM oss plugins")

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