From: "Daniel P. Berrangé" <berrange@redhat.com>
To: Kostiantyn Kostiuk <konstantin@daynix.com>
Cc: qemu-devel@nongnu.org, Michael Roth <mdroth@linux.vnet.ibm.com>
Subject: Re: [PATCH v2] qga-win: Free GMatchInfo properly
Date: Thu, 10 Jun 2021 17:02:10 +0100 [thread overview]
Message-ID: <YMI3gundDsLZq1lw@redhat.com> (raw)
In-Reply-To: <20210610155811.3313927-1-konstantin@daynix.com>
On Thu, Jun 10, 2021 at 06:58:11PM +0300, Kostiantyn Kostiuk wrote:
> The g_regex_match function creates match_info even if it
> returns FALSE. So we should always call g_match_info_free.
> A better solution is using g_autoptr for match_info variable.
>
> Signed-off-by: Kostiantyn Kostiuk <konstantin@daynix.com>
> ---
> qga/commands-win32.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/qga/commands-win32.c b/qga/commands-win32.c
> index 300b87c859..785a5cc6b2 100644
> --- a/qga/commands-win32.c
> +++ b/qga/commands-win32.c
> @@ -2494,7 +2494,7 @@ GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
> continue;
> }
> for (j = 0; hw_ids[j] != NULL; j++) {
> - GMatchInfo *match_info;
> + g_autoptr(GMatchInfo) match_info;
This should be initialized to NULL otherwise...
> GuestDeviceIdPCI *id;
> if (!g_regex_match(device_pci_re, hw_ids[j], 0, &match_info)) {
> continue;
this continue will trigger freeing of unintialized memory
Essentially all g_auto* variables should be init to NULL
at all times, even if it currently looks harmless.
> @@ -2511,7 +2511,6 @@ GuestDeviceInfoList *qmp_guest_get_devices(Error **errp)
> id->vendor_id = g_ascii_strtoull(vendor_id, NULL, 16);
> id->device_id = g_ascii_strtoull(device_id, NULL, 16);
>
> - g_match_info_free(match_info);
> break;
> }
> if (skip) {
Regards,
Daniel
--
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next prev parent reply other threads:[~2021-06-10 16:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 15:58 [PATCH v2] qga-win: Free GMatchInfo properly Kostiantyn Kostiuk
2021-06-10 16:02 ` Daniel P. Berrangé [this message]
2021-06-10 16:08 ` Konstantin Kostiuk
2021-06-10 16:14 ` Daniel P. Berrangé
2021-07-14 7:26 ` Konstantin Kostiuk
2021-07-28 7:54 ` Konstantin Kostiuk
2021-07-28 11:58 ` [PATCH-for-6.1 " Philippe Mathieu-Daudé
2021-06-10 16:04 ` [PATCH " Philippe Mathieu-Daudé
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