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exfat: Fix pontential use after free in exfat_load_upcase_table()

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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>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
This commit is contained in:
Dan Carpenter 2020-06-09 08:44:16 +09:00 • committed by Namjae Jeon
commit eef5c756ed
1 changed files with 1 additions and 1 deletions
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2
nls.c
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@ -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)