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Thu, 13 Feb 2025 21:08:54 +0800 From: gaoxu To: Andrew Morton CC: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Suren Baghdasaryan , Barry Song <21cnbao@gmail.com>, yipengxiang , "Hugh Dickins" , Chris Li Subject: =?utf-8?B?5Zue5aSNOiBbUEFUQ0hdIG1tOiBGaXggcG9zc2libGUgTlVMTCBwb2ludGVy?= =?utf-8?B?IGRlcmVmZXJlbmNlIGluIF9fc3dhcF9kdXBsaWNhdGU=?= Thread-Topic: [PATCH] mm: Fix possible NULL pointer dereference in __swap_duplicate Thread-Index: Adt8+0GogoLTL6hgQfOcUIXDGgpBSQAbnlYAACsSnkA= Date: Thu, 13 Feb 2025 13:08:54 +0000 Message-ID: References: <44655569e3a1419f800952004f07e714@honor.com> <20250212161820.4fda79a3333d2345b60cef72@linux-foundation.org> In-Reply-To: <20250212161820.4fda79a3333d2345b60cef72@linux-foundation.org> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 PiANCj4gT24gV2VkLCAxMiBGZWIgMjAyNSAwMzoxMzo0NiArMDAwMCBnYW94dSA8Z2FveHUyQGhv bm9yLmNvbT4gd3JvdGU6DQo+IA0KPiA+IHN3cF9zd2FwX2luZm8oKSBtYXkgcmV0dXJuIG51bGw7 IGl0IGlzIG5lY2Vzc2FyeSB0byBjaGVjayB0aGUgcmV0dXJuDQo+ID4gdmFsdWUgdG8gYXZvaWQg TlVMTCBwb2ludGVyIGRlcmVmZXJlbmNlLiBUaGUgY29kZSBmb3Igb3RoZXIgY2FsbHMgdG8NCj4g PiBzd3Bfc3dhcF9pbmZvKCkgaW5jbHVkZXMgY2hlY2tzLCBhbmQgX19zd2FwX2R1cGxpY2F0ZSgp IHNob3VsZCBhbHNvDQo+ID4gaW5jbHVkZSBjaGVja3MuDQo+IA0KPiBBY3R1YWxseSB2ZXJ5IGZl dyBvZiB0aGUgc3dwX3N3YXBfaW5mbygpIGNhbGxlcnMgY2hlY2sgZm9yIGEgTlVMTCByZXR1cm4u DQpUaGUgc3dhcGZpbGUuYyBmaWxlIGNvbnRhaW5zIHRocmVlIGluc3RhbmNlcyB3aGVyZSB0aGUg cmV0dXJuIHZhbHVlIG9mDQpzd3Bfc3dhcF9pbmZvKCkgaXMgY2hlY2tlZCBmb3IgYSBOVUxMIHJl dHVybi4gSW4gb3RoZXIgZmlsZXMgdGhhdCBjYWxsDQpzd3Bfc3dhcF9pbmZvKCksIEkgaGF2ZSBj b25maXJtZWQgdGhhdCB0aGVyZSBhcmUgbm8gc3VjaCBjaGVja3MuDQpUaGUgZGVzY3JpcHRpb24g aW4gdGhlIHBhdGNoIGlzIGluYWNjdXJhdGUsIGFuZCBJIGhhdmUgbWFkZSBtb2RpZmljYXRpb25z DQppbiBwYXRjaCB2Mi4NCj4gDQo+ID4gVGhlIHJlYXNvbiB3aHkgc3dwX3N3YXBfaW5mbygpIHJl dHVybnMgTlVMTCBpcyB1bmNsZWFyOyBpdCBtYXkgYmUgZHVlDQo+ID4gdG8gQ1BVIGNhY2hlIGlz c3VlcyBvciBERFIgYml0IGZsaXBzLg0KPiANCj4gUXVpdGUgcG9zc2libHkgaXQncyBhIGtlcm5l bCBidWcuDQo+IA0KPiA+IFRoZSBwcm9iYWJpbGl0eSBvZiB0aGlzIGlzc3VlIGlzIHZlcnkNCj4g PiBzbWFsbCwgYW5kIHRoZSBzdGFjayBpbmZvIHdlIGVuY291bnRlcmVkIGlzIGFzIGZvbGxvd3Pv vJoNCj4gPiBVbmFibGUgdG8gaGFuZGxlIGtlcm5lbCBOVUxMIHBvaW50ZXIgZGVyZWZlcmVuY2Ug YXQgdmlydHVhbCBhZGRyZXNzDQo+ID4gMDAwMDAwMDAwMDAwMDA1OA0KPiA+DQo+ID4gLi4uDQo+ ID4NCj4gPiAtLS0gYS9tbS9zd2FwZmlsZS5jDQo+ID4gKysrIGIvbW0vc3dhcGZpbGUuYw0KPiA+ IEBAIC0zNTIxLDYgKzM1MjEsOCBAQCBzdGF0aWMgaW50IF9fc3dhcF9kdXBsaWNhdGUoc3dwX2Vu dHJ5X3QgZW50cnksDQo+IHVuc2lnbmVkIGNoYXIgdXNhZ2UsIGludCBucikNCj4gPiAgCWludCBl cnIsIGk7DQo+ID4NCj4gPiAgCXNpID0gc3dwX3N3YXBfaW5mbyhlbnRyeSk7DQo+ID4gKwlpZiAo dW5saWtlbHkoIXNpKSkNCj4gPiArCQlyZXR1cm4gLUVJTlZBTDsNCj4gPg0KPiA+ICAJb2Zmc2V0 ID0gc3dwX29mZnNldChlbnRyeSk7DQo+ID4gIAlWTV9XQVJOX09OKG5yID4gU1dBUEZJTEVfQ0xV U1RFUiAtIG9mZnNldCAlIFNXQVBGSUxFX0NMVVNURVIpOw0KPiANCj4gT0ssIEkgZ3Vlc3MgYXZv aWRpbmcgdGhlIGNyYXNoIGlzIGdvb2QuICBCdXQgcGxlYXNlIGxldCdzIGluY2x1ZGUgYSBXQVJO IHNvIHRoYXQNCj4gd2UgY2FuIHBlcmhhcHMgZml4IHRoZSBidWcsIGlmIG9uZSBpcyB0aGVyZS4N Ckdvb2QuIEknbGwgY2hhbmdlIGl0IGFzIG1lbnRpb25lZCBhbmQgc2VuZCBhIG5ldyBwYXRjaC4N CglzaSA9IHN3cF9zd2FwX2luZm8oZW50cnkpOw0KKwlpZiAodW5saWtlbHkoIXNpKSkgew0KKwkJ V0FSTigxLCBLRVJOX0VSUiAiJXM6ICVzJTA4bHhcbiIsIF9fZnVuY19fLCBCYWRfZmlsZSwgZW50 cnkudmFsKTsNCisJCXJldHVybiAtRUlOVkFMOw0KKwl9DQoNCg0K