linux-kernel - Re: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in __bch2_bkey_unpack

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Message-ID: <CAPZ5DTGrXzDXXB_2DauvTz7zJ+jni262rkiZ_SYbtAxEES0cXg@mail.gmail.com>
Date: Sun, 1 Jun 2025 21:07:04 +0530
From: Bharadwaj Raju <bharadwaj.raju777@...il.com>
To: syzbot+cfd994b9cdf00446fd54@...kaller.appspotmail.com
Cc: Kent Overstreet <kent.overstreet@...ux.dev>, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in __bch2_bkey_unpack_key

The bad format is actually caught by
btree_err_on(bch2_bkey_format_invalid(c, &bn->format, write, &buf1),
...) in validate_bset,
but since the return from __btree_err matches BCH_err_fsck_fix, the
code doesn't really do anything about it.