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SubjectRe: UBSAN: shift-out-of-bounds in ext4_fill_super
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Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+345b75652b1d24227443@syzkaller.appspotmail.com

Tested on:

commit: e360ba58 ext4: fix a memory leak of ext4_free_data
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
kernel config: https://syzkaller.appspot.com/x/.config?x=fe9725f8845d9fe6
dashboard link: https://syzkaller.appspot.com/bug?extid=345b75652b1d24227443
compiler: gcc (GCC) 10.1.0-syz 20200507
patch: https://syzkaller.appspot.com/x/patch.diff?x=1166cf17500000

Note: testing is done by a robot and is best-effort only.

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