From: Erik Faye-Lund <kusmabite@gmail.com>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Philip Oakley <philipoakley@iee.org>,
"Koch, Rick (Subcontractor)" <Rick.Koch@tbe.com>,
Git List <git@vger.kernel.org>
Subject: Re: CPPCheck found 24 high risk bugs in Git v.1.8.3.4
Date: Wed, 21 Aug 2013 00:26:38 +0200 [thread overview]
Message-ID: <CABPQNSZSXgvLw_i25em38B70EgtZrv9iQh8OaCJzYRCk2vjZXQ@mail.gmail.com> (raw)
In-Reply-To: <87eh9op5gq.fsf@igel.home>
On Tue, Aug 20, 2013 at 8:44 PM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> Erik Faye-Lund <kusmabite@gmail.com> writes:
>
>> diff --git a/compat/win32/syslog.c b/compat/win32/syslog.c
>> index d015e43..0641f4e 100644
>> --- a/compat/win32/syslog.c
>> +++ b/compat/win32/syslog.c
>> @@ -43,11 +43,14 @@ void syslog(int priority, const char *fmt, ...)
>> va_end(ap);
>>
>> while ((pos = strstr(str, "%1")) != NULL) {
>> - str = realloc(str, ++str_len + 1);
>> - if (!str) {
>> + char *tmp = realloc(str, ++str_len + 1);
>> + if (!tmp) {
>> warning("realloc failed: '%s'", strerror(errno));
>> + free(str);
>> return;
>> }
>> + pos = tmp + (pos - str);
>
> Pedantically, this is undefined (uses of both pos and str may trap after
> realloc has freed the original pointer), it is better to calculate the
> difference before calling realloc.
I don't see how it's undefined. It's using the memory that 'pos'
*points to* that is undefined, no? The difference between 'pos' and
'str' should still be the same, it's not like realloc somehow
magically updates 'pos'...
next prev parent reply other threads:[~2013-08-20 22:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-19 17:09 CPPCheck found 24 high risk bugs in Git v.1.8.3.4 Koch, Rick (Subcontractor)
2013-08-19 20:03 ` Philip Oakley
2013-08-19 20:40 ` Jeff King
2013-08-19 20:46 ` Junio C Hamano
2013-08-19 20:52 ` Johan Herland
[not found] ` <85C8141E5DAD94428A121F706995A31F010F116FDADE@MX1.net.tbe.com>
2013-08-19 21:46 ` Philip Oakley
2013-08-23 19:51 ` CPPCheck found 24 high risk bugs in Git v.1.8.3.4 (fetch.c L588) Philip Oakley
2013-08-19 22:55 ` CPPCheck found 24 high risk bugs in Git v.1.8.3.4 Philip Oakley
2013-08-19 23:15 ` Erik Faye-Lund
2013-08-20 14:33 ` Jeff King
2013-08-20 18:44 ` Andreas Schwab
2013-08-20 20:34 ` René Scharfe
2013-08-20 22:28 ` Erik Faye-Lund
2013-08-20 22:26 ` Erik Faye-Lund [this message]
2013-08-20 23:01 ` Andreas Schwab
2013-08-20 23:45 ` Junio C Hamano
2013-08-21 0:01 ` Erik Faye-Lund
2013-08-19 21:36 ` Stefan Beller
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