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nls: utf8_wcstombs: fix buffer overflow

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utf8_wcstombs forgot to include one-byte UTF-8 characters when
calculating the output buffer size, i.e., theoretically, it was possible
to overflow the output buffer with an input string that contains enough
ASCII characters.

In practice, this was no problem because the only user so far (VFAT)
always uses a big enough output buffer.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Clemens Ladisch 2009-04-24 10:11:56 +02:00 committed by Greg Kroah-Hartman
parent e27ecdd94d
commit 905c02acbd
1 changed files with 1 additions and 0 deletions
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fs/nls/nls_base.c
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@ -150,6 +150,7 @@ utf8_wcstombs(__u8 *s, const wchar_t *pwcs, int maxlen)
}
} else {
*op++ = (__u8) *ip;
maxlen--;
}
ip++;
}