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exfat: Fix potential 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>
Git-commit: fc961522ddbdf00254dd03b677627139cc1f68bc
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: lixiang <lixiang@codeaurora.org>
This commit is contained in:
Dan Carpenter 2021-02-10 15:25:37 +08:00 • committed by lixiang
commit a9516936e5
1 changed files with 1 additions and 1 deletions
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2
fs/exfat/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)