linux-kernel - Re: [PATCH] erofs: fix potential overflow calculating xattr

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Message-ID: <363cf8e8-326b-6547-b780-268ce2e3c1a5@kernel.org>
Date:   Sun, 16 Apr 2023 22:47:00 +0800
From:   Chao Yu <chao@...nel.org>
To:     Jingbo Xu <jefflexu@...ux.alibaba.com>, xiang@...nel.org,
        huyue2@...lpad.com, linux-erofs@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] erofs: fix potential overflow calculating xattr_isize

On 2023/4/14 14:18, Jingbo Xu wrote:
> Given on-disk i_xattr_icount is 16 bits and xattr_isize is calculated
> from i_xattr_icount multiplying 4, xattr_isize has a theoretical maximum
> of 256K (64K * 4).
> 
> Thus declare xattr_isize as unsigned int to avoid the potential overflow.
> 
> Fixes: bfb8674dc044 ("staging: erofs: add erofs in-memory stuffs")
> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>

Good catch!

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,