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Date: Sat, 8 May 2021 00:24:11 +0800
From: butt3rflyh4ck <>
Subject: Re: Linux kernel: f2fs: out-of-bounds memory access bug

The patch is for this issue in upstream linux:


On Mon, Mar 29, 2021 at 12:00 AM butt3rflyh4ck
<> wrote:
> Hi,
> I reported an out of bounds memory access bug in get_next_net_page()
> in fs/f2fs/node.c and reproduce in 5.12.0-rc3. Now the patch is out
> and tested it in 5.12.0-rc4.
> Root Cause:
>  the f2fs_flush_nat_entries()  function is called during the
> checkpointing process,
> when it flush dirty nats in nat entry sets, it will call
> __flush_nat_entry_set(), but before call it,the legality of nids is
> not correctly tested. If the nids is out of range, may access
> out-of-bounds memory.
> Some details and Patch for this issue:
> Now the patch is not available in upstream, CVE is not assigned.
> Now announced on
> This issue was discovered by the ADLab of venustech.
> Regards,
>  butt3rflyh4ck.

Active Defense Lab of Venustech

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