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null iconv outbuf

From: Ilya N. Golubev
Subject: null iconv outbuf
Date: Tue, 22 Apr 2003 16:10:07 (GMT)

Versions: all at least since 20-Apr-98

`charset.texi' says about iconv():

> If @var{outbuf} or @address@hidden is a null pointer, the
> conversion is performed but no output is available.

But `iconv.c' unconditionally dereferences `outbuf', at least when

!(__builtin_expect (inbuf == NULL || *inbuf == NULL, 0))

This causes segv when `outbuf' is a null pointer.

I do not submit a patch since I have not figured out which output
pointers are allowed by `__gconv' called by `iconv'.

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