[syzbot] [jffs2?] KASAN: slab-out-of-bounds Read in jffs2_sum_add_kvec

[syzbot]

syzbot suspects this issue was fixed by commit:

commit c6854e5a267c28300ff045480b5a7ee7f6f1d913
Author: Ilya Denisyev <dev at elkcl.ru>
Date:   Fri Apr 12 15:53:54 2024 +0000

    jffs2: prevent xattr node from overflowing the eraseblock

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12204ae1980000
start commit:   fe46a7dd189e Merge tag 'sound-6.9-rc1' of git://git.kernel..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=aef2a55903e5791c
dashboard link: https://syzkaller.appspot.com/bug?extid=d7c218ea1def103f6bcd
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1309ca57180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15f9afeb180000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: jffs2: prevent xattr node from overflowing the eraseblock

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