From: Jamie Lokier <jamie@shareable.org>
To: malc <av1474@comtv.ru>
Cc: qemu-devel@nongnu.org, Eduardo Habkost <ehabkost@redhat.com>,
Markus Armbruster <armbru@redhat.com>
Subject: Re: [Qemu-devel] [PATCH] fix qemu_malloc() error check for size==0
Date: Tue, 19 May 2009 21:37:04 +0100 [thread overview]
Message-ID: <20090519203704.GE3986@shareable.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0905191852030.4108@linmac.oyster.ru>
malc wrote:
> 3) Test the returned value against NULL
Indeed, that makes malloc(0) a bad idea, and why GNU/Linux sensibly
makes it return a non-NULL pointer, to minimise unexpected behaviour
of programs.
> 4) Accidentally derefence it
>
> And here one would get away with it on certain subset of systems.
That's not in the list of reliable things, though.
You mustn't accidentally dereference p[n] after calling p = malloc(n) either.
-- Jamie
next prev parent reply other threads:[~2009-05-19 20:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-18 20:31 [Qemu-devel] [PATCH] fix qemu_malloc() error check for size==0 Eduardo Habkost
2009-05-18 21:56 ` malc
2009-05-18 22:17 ` Eduardo Habkost
2009-05-19 0:17 ` malc
2009-05-19 6:44 ` Markus Armbruster
2009-05-19 13:00 ` malc
2009-05-19 13:37 ` Markus Armbruster
2009-05-19 14:06 ` malc
2009-05-19 14:28 ` Eduardo Habkost
2009-05-19 14:48 ` malc
2009-05-19 14:56 ` Eduardo Habkost
2009-05-19 15:23 ` malc
2009-05-19 15:43 ` Eduardo Habkost
2009-05-19 20:32 ` Jamie Lokier
2009-05-19 22:12 ` Eduardo Habkost
2009-05-19 22:49 ` Jamie Lokier
2009-05-20 3:28 ` Eduardo Habkost
2009-05-19 20:31 ` Jamie Lokier
2009-05-19 16:09 ` Markus Armbruster
2009-05-19 14:02 ` Eduardo Habkost
2009-05-19 14:37 ` malc
2009-05-19 14:44 ` Eduardo Habkost
2009-05-19 14:55 ` malc
2009-05-19 16:44 ` [PATCH] Make qemu_alloc()/qemu_realloc() return NULL for size==0 (was Re: [Qemu-devel] [PATCH] fix qemu_malloc() error check for size==0) Eduardo Habkost
2009-05-19 18:40 ` malc
2009-05-19 19:38 ` Eduardo Habkost
2009-05-19 20:34 ` Jamie Lokier
2009-05-20 8:00 ` Kevin Wolf
2009-05-20 9:30 ` [Qemu-devel] Re: [PATCH] Make qemu_alloc()/qemu_realloc() return NULL for size==0 Markus Armbruster
2009-05-20 18:20 ` malc
2009-05-19 20:37 ` Jamie Lokier [this message]
2009-05-19 13:52 ` [Qemu-devel] [PATCH] fix qemu_malloc() error check " Eduardo Habkost
2009-05-19 14:39 ` malc
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