linux-kernel - Re: [PATCH] fs/ntfs3: Don't clear upper bits accidentally in log

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Date:   Thu, 19 May 2022 09:55:45 +0900
From:   Namjae Jeon <linkinjeon@...nel.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        kernel-janitors <kernel-janitors@...r.kernel.org>,
        Kari Argillander <kari.argillander@...rgateuniverse.net>,
        Kari Argillander <kari.argillander@...il.com>
Subject: Re: [PATCH] fs/ntfs3: Don't clear upper bits accidentally in log_replay()

2022-05-09 18:03 GMT+09:00, Dan Carpenter <dan.carpenter@...cle.com>:
> The "vcn" variable is a 64 bit.  The "log->clst_per_page" variable is a
> u32.  This means that the mask accidentally clears out the high 32 bits
> when it was only supposed to clear some low bits.  Fix this by adding a
> cast to u64.
>
> Fixes: b46acd6a6a62 ("fs/ntfs3: Add NTFS journal")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Namjae Jeon <linkinjeon@...nel.org>

> ---
> Why am I getting new Smatch warnings in old ntfs3 code?  It is a mystery.
>
>  fs/ntfs3/fslog.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c
> index 915f42cf07bc..0da339fda2f4 100644
> --- a/fs/ntfs3/fslog.c
> +++ b/fs/ntfs3/fslog.c
> @@ -5057,7 +5057,7 @@ int log_replay(struct ntfs_inode *ni, bool
> *initialized)
>  		goto add_allocated_vcns;
>
>  	vcn = le64_to_cpu(lrh->target_vcn);
> -	vcn &= ~(log->clst_per_page - 1);
> +	vcn &= ~(u64)(log->clst_per_page - 1);
>
>  add_allocated_vcns:
>  	for (i = 0, vcn = le64_to_cpu(lrh->target_vcn),
> --
> 2.35.1
>
>
>