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Re: [bug-libunistring] SIGSEGV on malloc() failure

From: Bruno Haible
Subject: Re: [bug-libunistring] SIGSEGV on malloc() failure
Date: Sat, 26 Jan 2019 21:50:56 +0100
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[CCing bug-gnulib, since the function 'iconveh_open' comes from gnulib.]

Tim Rühsen wrote in
> I just tested random malloc() failures and stumbled upon a SIGSEGV
> (details below).
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff7dd1f61 in __gconv_close (cd=0x0) at gconv_close.c:34
> 34      gconv_close.c: Datei oder Verzeichnis nicht gefunden.
> (gdb) bt
> #0  0x00007ffff7dd1f61 in __gconv_close (cd=0x0) at gconv_close.c:34
> #1  0x00007ffff7dd185f in iconv_close (cd=<optimized out>) at
> iconv_close.c:35
> #2  0x00007ffff7c3ddc3 in libunistring_iconveh_open () from
> /usr/lib/x86_64-linux-gnu/libunistring.so.2
> #3  0x00007ffff7c3dfcd in libunistring_mem_iconveh () from
> /usr/lib/x86_64-linux-gnu/libunistring.so.2

Thanks for the report. The stack trace immediately tells me where
the problem comes from. This patch should fix it.

It has been a long-standing bug (introduced on 2009-08-30).

2019-01-26  Bruno Haible  <address@hidden>

        striconveh: Fix use of uninitialized iconv_t.
        Reported by Tim Rühsen <address@hidden> in
        * lib/striconveh.c (iconveh_open): Correct the iconv_close argument.

diff --git a/lib/striconveh.c b/lib/striconveh.c
index d4cc503..91184be 100644
--- a/lib/striconveh.c
+++ b/lib/striconveh.c
@@ -73,7 +73,7 @@ iconveh_open (const char *to_codeset, const char 
*from_codeset, iconveh_t *cdp)
           int saved_errno = errno;
           if (cd != (iconv_t)(-1))
-            iconv_close (cdp->cd);
+            iconv_close (cd);
           errno = saved_errno;
           return -1;

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