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Re: [Qemu-devel] [Qemu-block] [PATCH for-2.6] crypto: Avoid memory leak

From: Markus Armbruster
Subject: Re: [Qemu-devel] [Qemu-block] [PATCH for-2.6] crypto: Avoid memory leak on failure
Date: Thu, 07 Apr 2016 17:14:11 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)

Max Reitz <address@hidden> writes:

> On 01.04.2016 17:57, Eric Blake wrote:
>> Commit 7836857 introduced a memory leak due to invalid use of
>> Error vs. visit_type_end().  If visiting the intermediate
>> members fails, we clear the error and unconditionally use
>> visit_end_struct() on the same error object; but if that
>> cleanup succeeds, we then skip the qapi_free call.
> It's not really a memleak. Due to skipping those conditional branches
> after the "out" label, a non-null value will be returned. In order to
> determine whether the function call failed, the callers of these
> functions do not use the errp value but the return value. Therefore,
> they will think the call succeeded when actually it did not.

Please amend the commit message accordingly.

>> Until a later patch adds visit_check_struct(), the only safe
>> approach is to use two separate error objects.
>> Signed-off-by: Eric Blake <address@hidden>
>> ---
>>  block/crypto.c | 12 ++++++------
>>  1 file changed, 6 insertions(+), 6 deletions(-)
> Anyway, thanks, applied to my block branch:
> https://github.com/XanClic/qemu/commits/block
> Max

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