Bug#222891: marked as done (libc6: strdup (NULL) segfaults)
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and subject line Bug#222891: libc6: strdup (NULL) segfaults
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From: Robert Millan <rmh@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libc6: strdup (NULL) segfaults
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Date: Thu, 04 Dec 2003 16:39:05 +0100
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Package: libc6
Version: 2.3.2.ds1-10
Severity: normal
Calling strdup (NULL) causes a segmentation fault in libc:
Starting program: /tmp/test
Program received signal SIGSEGV, Segmentation fault.
0x40098a8f in strlen () from /lib/libc.so.6
The documentation doesn't say the string can't be NULL. When that happens,
I'd expect it to not segfault and return NULL either.
-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux aragorn 2.4.18-1-k7 #3 Sat Nov 29 10:23:13 EST 2003 i686
Locale: LANG=ca_ES@euro, LC_CTYPE=ca_ES@euro
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-7 The Berkeley database routines [gl
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Date: Thu, 4 Dec 2003 11:58:19 -0500
From: Daniel Jacobowitz <dan@debian.org>
To: Robert Millan <rmh@debian.org>, 222891-done@bugs.debian.org
Subject: Re: Bug#222891: libc6: strdup (NULL) segfaults
Message-ID: <20031204165819.GA4796@nevyn.them.org>
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On Thu, Dec 04, 2003 at 04:39:05PM +0100, Robert Millan wrote:
> Package: libc6
> Version: 2.3.2.ds1-10
> Severity: normal
>
> Calling strdup (NULL) causes a segmentation fault in libc:
>
> Starting program: /tmp/test
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x40098a8f in strlen () from /lib/libc.so.6
>
> The documentation doesn't say the string can't be NULL. When that happens,
> I'd expect it to not segfault and return NULL either.
This is not a bug.
DESCRIPTION
The strdup() function returns a pointer to a new string which
is a duplicate of the string s.
NULL is not a valid string argument, so the function has no obligation
to behave reasonably. So it doesn't. This is standard behavior for
just about all C library functions.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
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