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Mon, 09 May 2022 18:32:54 +0000 Message-ID: <51254d3d-af8d-61b3-e8a2-8fd0e583e783@suse.de> Date: Mon, 9 May 2022 20:32:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: Re: [PATCH v3 1/4] fbdev: Prevent possible use-after-free in fb_release() Content-Language: en-US To: Javier Martinez Canillas , Andrzej Hajda , linux-kernel@vger.kernel.org Cc: linux-fbdev@vger.kernel.org, Daniel Vetter , Helge Deller , dri-devel@lists.freedesktop.org, Daniel Vetter References: <20220505215947.364694-1-javierm@redhat.com> <20220505220413.365977-1-javierm@redhat.com> <753d0350-42dc-389b-b10b-4533ddcf32ac@intel.com> <1f788b8f-0bea-1818-349e-b1bc907bf251@redhat.com> <3b7fe4fe-fdec-cef2-4e0e-309d9dc4a8af@redhat.com> From: Thomas Zimmermann In-Reply-To: <3b7fe4fe-fdec-cef2-4e0e-309d9dc4a8af@redhat.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------6BCuQbmZJwIWsnYIUbFyB0B5" X-Spam-Status: No, score=-3.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,RDNS_NONE,SPF_HELO_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------6BCuQbmZJwIWsnYIUbFyB0B5 Content-Type: multipart/mixed; boundary="------------8pTehAEcyWCBSsbBrQmlHNom"; protected-headers="v1" From: Thomas Zimmermann To: Javier Martinez Canillas , Andrzej Hajda , linux-kernel@vger.kernel.org Cc: linux-fbdev@vger.kernel.org, Daniel Vetter , Helge Deller , dri-devel@lists.freedesktop.org, Daniel Vetter Message-ID: <51254d3d-af8d-61b3-e8a2-8fd0e583e783@suse.de> Subject: Re: [PATCH v3 1/4] fbdev: Prevent possible use-after-free in fb_release() References: <20220505215947.364694-1-javierm@redhat.com> <20220505220413.365977-1-javierm@redhat.com> <753d0350-42dc-389b-b10b-4533ddcf32ac@intel.com> <1f788b8f-0bea-1818-349e-b1bc907bf251@redhat.com> <3b7fe4fe-fdec-cef2-4e0e-309d9dc4a8af@redhat.com> In-Reply-To: <3b7fe4fe-fdec-cef2-4e0e-309d9dc4a8af@redhat.com> --------------8pTehAEcyWCBSsbBrQmlHNom Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 SGkNCg0KQW0gMDkuMDUuMjIgdW0gMTg6MzMgc2NocmllYiBKYXZpZXIgTWFydGluZXogQ2Fu aWxsYXM6DQo+IE9uIDUvOS8yMiAxNzo1MSwgQW5kcnplaiBIYWpkYSB3cm90ZToNCj4gDQo+ IFtzbmlwXQ0KPiANCj4+Pj4+ICsNCj4+Pj4gUmVnYXJkaW5nIGRybToNCj4+Pj4gV2hhdCBh Ym91dCBkcm1fZmJfaGVscGVyX2Zpbmk/IEl0IGNhbGxzIGFsc28gZnJhbWVidWZmZXJfcmVs ZWFzZSBhbmQgaXMNCj4+Pj4gY2FsbGVkIG9mdGVuIGZyb20gX3JlbW92ZSBwYXRocyAoY2hl Y2tlZCBpbnRlbC9yYWRlb24vbm91dmVhdSkuIEkgZ3Vlc3MNCj4+Pj4gaXQgc2hvdWxkIGJl IGZpeGVkIGFzIHdlbGwuIERvIHlvdSBwbGFuIHRvIGZpeCBpdD8NCj4+Pj4NCj4+PiBJIHRo aW5rIHlvdSBhcmUgY29ycmVjdC4gTWF5YmUgd2UgbmVlZCBzb21ldGhpbmcgbGlrZSB0aGUg Zm9sbG93aW5nPw0KPj4+DQo+Pj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvZ3B1L2RybS9kcm1f ZmJfaGVscGVyLmMgYi9kcml2ZXJzL2dwdS9kcm0vZHJtX2ZiX2hlbHBlci5jDQo+Pj4gaW5k ZXggZDI2NWE3MzMxM2M5Li5iMDk1OThmN2FmMjggMTAwNjQ0DQo+Pj4gLS0tIGEvZHJpdmVy cy9ncHUvZHJtL2RybV9mYl9oZWxwZXIuYw0KPj4+ICsrKyBiL2RyaXZlcnMvZ3B1L2RybS9k cm1fZmJfaGVscGVyLmMNCj4+PiBAQCAtNjMxLDcgKzYzMSw2IEBAIHZvaWQgZHJtX2ZiX2hl bHBlcl9maW5pKHN0cnVjdCBkcm1fZmJfaGVscGVyICpmYl9oZWxwZXIpDQo+Pj4gICAgICAg ICAgIGlmIChpbmZvKSB7DQo+Pj4gICAgICAgICAgICAgICAgICAgaWYgKGluZm8tPmNtYXAu bGVuKQ0KPj4+ICAgICAgICAgICAgICAgICAgICAgICAgICAgZmJfZGVhbGxvY19jbWFwKCZp bmZvLT5jbWFwKTsNCj4+PiAtICAgICAgICAgICAgICAgZnJhbWVidWZmZXJfcmVsZWFzZShp bmZvKTsNCg0KQWZ0ZXIgcmV2aWV3aW5nIHRoYXQgY29kZSwgIGRybV9mYl9oZWxwZXJfZmlu aSgpIGFwcGVhcnMgdG8gYmUgY2FsbGVkIA0KZnJvbSAuZmJfZGVzdHJveSAoc2VlIGRybV9m YmRldl9yZWxlYXNlKS4gIFRoZSBjb2RlIGlzIGhhcmQgdG8gZm9sbG93IA0KdGhvdWdoLiAg SWYgdGhlcmUgYW5vdGhlciB3YXkgb2YgcmVsZWFzaW5nIHRoZSBmcmFtZWJ1ZmZlciBoZXJl Pw0KDQpCZXN0IHJlZ2FyZHMNClRob21hcw0KDQo+Pg0KPj4gV2hhdCBhYm91dCBjbWFwPyBJ IGFtIG5vdCBhbiBmYiBleHBlcnQsIGJ1dCBJTU8gY21hcCBjYW4gYmUgYWNjZXNzZWQNCj4+ IGZyb20gdXNlcnNwYWNlIGFzIHdlbGwuDQo+Pg0KPiANCj4gSSBhY3R1YWxseSB0aG91Z2h0 IGFib3V0IHRoZSBzYW1lIGJ1dCB0aGVuIHJlbWVtYmVyZWQgd2hhdCBEYW5pZWwgc2FpZCBp biBbMF0NCj4gKEFGQUlVIGF0IGxlYXN0KSB0aGF0IHRoZXNlIHNob3VsZCBiZSBkb25lIGlu IC5yZW1vdmUoKSBzbyB0aGUgY3VycmVudCBjb2RlDQo+IGxvb2tzIGxpa2UgbWF0Y2hlcyB0 aGF0IGFuZCBvbmx5IGZyYW1lYnVmZmVyX3JlbGVhc2UoKSBzaG91bGQgYmUgbW92ZWQuDQo+ IA0KPiBGb3IgdmVzYWZiIGEgcHJldmlvdXMgcGF0Y2ggcHJvcG9zZWQgdG8gYWxzbyBtb3Zl IGEgcmVsZWFzZV9yZWdpb24oKSBjYWxsIHRvDQo+IC5mYl9kZXN0cm95KCkgYW5kIERhbmll bCBhbHNvIHNhaWQgdGhhdCBpdCB3YXMgaWZmeSBhbmQgc2hvdWxkbid0IGJlIGRvbmUgWzFd Lg0KPiANCj4gQnV0IEknbSBhbHNvIG5vdCBmYiBleHBlcnQgc28gaGFwcHkgdG8gbW92ZSBm Yl9kZWFsbG9jX2NtYXAoKSBhcyB3ZWxsIGlmIHRoYXQNCj4gaXMgdGhlIGNvcnJlY3QgdGhp bmcgdG8gZG8uDQo+IA0KPiBbMF06IGh0dHBzOi8vd3d3LnNwaW5pY3MubmV0L2xpc3RzL2Ry aS1kZXZlbC9tc2czNDYyNTcuaHRtbA0KPiBbMV06IGh0dHBzOi8vd3d3LnNwaW5pY3MubmV0 L2xpc3RzL2RyaS1kZXZlbC9tc2czNDYyNjEuaHRtbA0KPiANCg0KLS0gDQpUaG9tYXMgWmlt bWVybWFubg0KR3JhcGhpY3MgRHJpdmVyIERldmVsb3Blcg0KU1VTRSBTb2Z0d2FyZSBTb2x1 dGlvbnMgR2VybWFueSBHbWJIDQpNYXhmZWxkc3RyLiA1LCA5MDQwOSBOw7xybmJlcmcsIEdl cm1hbnkNCihIUkIgMzY4MDksIEFHIE7DvHJuYmVyZykNCkdlc2Now6RmdHNmw7xocmVyOiBJ dm8gVG90ZXYNCg== --------------8pTehAEcyWCBSsbBrQmlHNom-- --------------6BCuQbmZJwIWsnYIUbFyB0B5 Content-Type: application/pgp-signature; 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