From: "Namjae Jeon" <namjae.jeon@samsung.com>
To: 'Dan Carpenter' <dan.carpenter@oracle.com>
Cc: 'Sungjong Seo' <sj1557.seo@samsung.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org,
'Tetsuhiro Kohada' <kohada.t2@gmail.com>
Subject: RE: [PATCH] exfat: Fix pontential use after free in exfat_load_upcase_table()
Date: Tue, 09 Jun 2020 00:37:48 +0000 [thread overview]
Message-ID: <00a401d63df6$3370adc0$9a520940$@samsung.com> (raw)
In-Reply-To: <20200608141629.GA1912173@mwanda>
> This code calls brelse(bh) and then dereferences "bh" on the next line resulting in a possible use
> after free. The brelse() should just be moved down a line.
>
> Fixes: b676fdbcf4c8 ("exfat: standardize checksum calculation")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Applied. Thanks!
> ---
> fs/exfat/nls.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c index c1ec056954974..57b5a7a4d1f7a 100644
> --- a/fs/exfat/nls.c
> +++ b/fs/exfat/nls.c
> @@ -692,8 +692,8 @@ static int exfat_load_upcase_table(struct super_block *sb,
> index++;
> }
> }
> - brelse(bh);
> chksum = exfat_calc_chksum32(bh->b_data, i, chksum, CS_DEFAULT);
> + brelse(bh);
> }
>
> if (index >= 0xFFFF && utbl_checksum = chksum)
> --
> 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: "Namjae Jeon" <namjae.jeon@samsung.com>
To: "'Dan Carpenter'" <dan.carpenter@oracle.com>
Cc: "'Sungjong Seo'" <sj1557.seo@samsung.com>,
<linux-fsdevel@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<kernel-janitors@vger.kernel.org>,
"'Tetsuhiro Kohada'" <kohada.t2@gmail.com>
Subject: RE: [PATCH] exfat: Fix pontential use after free in exfat_load_upcase_table()
Date: Tue, 9 Jun 2020 09:37:48 +0900 [thread overview]
Message-ID: <00a401d63df6$3370adc0$9a520940$@samsung.com> (raw)
In-Reply-To: <20200608141629.GA1912173@mwanda>
> This code calls brelse(bh) and then dereferences "bh" on the next line resulting in a possible use
> after free. The brelse() should just be moved down a line.
>
> Fixes: b676fdbcf4c8 ("exfat: standardize checksum calculation")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Applied. Thanks!
> ---
> fs/exfat/nls.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c index c1ec056954974..57b5a7a4d1f7a 100644
> --- a/fs/exfat/nls.c
> +++ b/fs/exfat/nls.c
> @@ -692,8 +692,8 @@ static int exfat_load_upcase_table(struct super_block *sb,
> index++;
> }
> }
> - brelse(bh);
> chksum = exfat_calc_chksum32(bh->b_data, i, chksum, CS_DEFAULT);
> + brelse(bh);
> }
>
> if (index >= 0xFFFF && utbl_checksum == chksum)
> --
> 2.26.2
next prev parent reply other threads:[~2020-06-09 0:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200608141649epcas1p14558f3552afb0fcd3cd32a8c09afb880@epcas1p1.samsung.com>
2020-06-08 14:16 ` [PATCH] exfat: Fix pontential use after free in exfat_load_upcase_table() Dan Carpenter
2020-06-08 14:16 ` Dan Carpenter
2020-06-09 0:37 ` Namjae Jeon [this message]
2020-06-09 0:37 ` Namjae Jeon
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