From: Tom Tromey <tom@tromey.com>
To: Yao Qi <qiyaoltc@gmail.com>
Cc: Tom Tromey <tom@tromey.com>,
"gdb-patches\@sourceware.org" <gdb-patches@sourceware.org>
Subject: Re: [RFA] PR gdb/17210 - fix possible memory leak in read_memory_robust
Date: Tue, 28 Jun 2016 14:40:00 -0000 [thread overview]
Message-ID: <87oa6lidhq.fsf@tromey.com> (raw)
In-Reply-To: <CAH=s-PMjZN9byLwAGs+yQjEhDzMJEe0RxGuT-tg89+DFxgk6ew@mail.gmail.com> (Yao Qi's message of "Tue, 28 Jun 2016 11:42:46 +0100")
>>>>> "Yao" == Yao Qi <qiyaoltc@gmail.com> writes:
Yao> On Thu, Jun 9, 2016 at 5:33 PM, Tom Tromey <tom@tromey.com> wrote:
>>
>> VEC(memory_read_result_s) *
>> @@ -1810,6 +1810,8 @@ read_memory_robust (struct target_ops *ops,
>> {
>> VEC(memory_read_result_s) *result = 0;
>> int unit_size = gdbarch_addressable_memory_unit_size (target_gdbarch ());
>> + struct cleanup *cleanup = make_cleanup (free_memory_read_result_vector,
>> + &result);
>>
Yao> result is a local variable on stack, so its address is meaningless when the
Yao> exception is throw, because the stack has already been destroyed.
Yao> Probably, we can register cleanup for result once it becomes to non-NULL,
Yao> and changes in free_memory_read_result_vector are not needed.
I don't think that will work, because resizing the vector may cause the
value to change. Though one option would be to discard the cleanup and
recreate it after each push.
Tom
next prev parent reply other threads:[~2016-06-28 14:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-09 16:34 Tom Tromey
2016-06-28 10:43 ` Yao Qi
2016-06-28 14:40 ` Tom Tromey [this message]
2016-06-28 17:48 ` Pedro Alves
2016-06-29 9:27 ` Yao Qi
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