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Wed, 7 Mar 2018 23:56:12 -0500 Received: from mail-by2nam03on0095.outbound.protection.outlook.com ([104.47.42.95]:43489 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755095AbeCHE4J (ORCPT ); Wed, 7 Mar 2018 23:56:09 -0500 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Prakash Kamliya , Sharat Masetty , Rob Clark , Sasha Levin Subject: [PATCH AUTOSEL for 4.15 08/78] drm/msm: fix leak in failed get_pages Thread-Topic: [PATCH AUTOSEL for 4.15 08/78] drm/msm: fix leak in failed get_pages Thread-Index: AQHTtpnC1K2jE6b5H0KVHMcqhWr/gQ== Date: Thu, 8 Mar 2018 04:56:04 +0000 Message-ID: <20180308045525.7662-8-alexander.levin@microsoft.com> References: <20180308045525.7662-1-alexander.levin@microsoft.com> In-Reply-To: <20180308045525.7662-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0902;7:/+wa90zc530oB/soT8yVRCeNiZbUBzixs7Etq2ho9lYdTIQ1bsWcBGBtewbAMiBVbk1LX5JMbwggb1PzCCHevdgWhLOoH9gSRMYgQfZQutyvoqJa+Pug0IOvPek1v4VBl9thixsm0PrEbOKpmz5HA3edZbGfR242imKzszGg5sNiF5dJ1gsQJm3VLHUoA8SQknv4OhDkHkuTcy6Sdeu2oLC2iUPWZyl2Dbw9ZqETeXBBEtBU7+b5lwdmRxsM4lDc;20:RLvBDVsON29GClo4Gl8XLmh9RlR2AsACyVASnu3OAcEzkwH5iMgyW9vQo4qgFB9HQ0iQ++BrtaxxnuTNwckcvl7nXFX+MU57bDlN2rMlWaZUQIesfB5C4uhTZ6QebTi6ILT070Y9bGRomB6QcoEmC5VjpCYrxg3q0Ih05x1S1EE= x-ms-exchange-antispam-srfa-diagnostics: SOS; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7c599bf2-47b0-4b90-321d-08d584b0e5a1 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Mar 2018 04:56:04.1488 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB0902 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Prakash Kamliya [ Upstream commit 62e3a3e342af3c313ab38603811ecdb1fcc79edb ] get_pages doesn't keep a reference of the pages allocated when it fails later in the code path. This can lead to a memory leak. Keep reference of the allocated pages so that it can be freed when msm_gem_free_object gets called later during cleanup. Signed-off-by: Prakash Kamliya Signed-off-by: Sharat Masetty Signed-off-by: Rob Clark Signed-off-by: Sasha Levin --- drivers/gpu/drm/msm/msm_gem.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index 81fe6d6740ce..07376de9ff4c 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -93,14 +93,17 @@ static struct page **get_pages(struct drm_gem_object *o= bj) return p; } =20 + msm_obj->pages =3D p; + msm_obj->sgt =3D drm_prime_pages_to_sg(p, npages); if (IS_ERR(msm_obj->sgt)) { + void *ptr =3D ERR_CAST(msm_obj->sgt); + dev_err(dev->dev, "failed to allocate sgt\n"); - return ERR_CAST(msm_obj->sgt); + msm_obj->sgt =3D NULL; + return ptr; } =20 - msm_obj->pages =3D p; - /* For non-cached buffers, ensure the new pages are clean * because display controller, GPU, etc. are not coherent: */ @@ -135,7 +138,10 @@ static void put_pages(struct drm_gem_object *obj) if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl, msm_obj->sgt->nents, DMA_BIDIRECTIONAL); - sg_free_table(msm_obj->sgt); + + if (msm_obj->sgt) + sg_free_table(msm_obj->sgt); + kfree(msm_obj->sgt); =20 if (use_pages(obj)) --=20 2.14.1