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    SubjectRe: [syzbot] [bluetooth?] KASAN: null-ptr-deref Read in ida_free (4)
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    syzbot suspects this issue was fixed by commit:

    commit af73483f4e8b6f5c68c9aa63257bdd929a9c194a
    Author: Matthew Wilcox (Oracle) <willy@infradead.org>
    Date: Thu Dec 21 16:53:57 2023 +0000

    ida: Fix crash in ida_free when the bitmap is empty

    bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12fc6ba2180000
    start commit: b46ae77f6787 Merge tag 'xfs-6.7-fixes-3' of git://git.kern..
    git tree: upstream
    kernel config: https://syzkaller.appspot.com/x/.config?x=6ae1a4ee971a7305
    dashboard link: https://syzkaller.appspot.com/bug?extid=51baee846ddab52d5230
    syz repro: https://syzkaller.appspot.com/x/repro.syz?x=127837cce80000
    C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12779dc8e80000

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

    #syz fix: ida: Fix crash in ida_free when the bitmap is empty

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

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