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Howlett" To: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , linux-next@vger.kernel.org Cc: "Liam R. Howlett" , Sanan Hasanov , Matthew Wilcox , David Hildenbrand , Hugh Dickins Subject: [PATCH] mm/mmap: Fix vma_merge() offset when expanding the next vma Date: Mon, 30 Jan 2023 14:57:13 -0500 Message-Id: <20230130195713.2881766-1-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.39.0 X-ClientProxiedBy: YT2PR01CA0014.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:38::19) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|PH0PR10MB4776:EE_ X-MS-Office365-Filtering-Correlation-Id: ae3daeb5-41e1-4e0b-031d-08db02fc30f1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SN6PR10MB3022.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230025)(366004)(396003)(39860400002)(346002)(136003)(376002)(451199018)(4326008)(41300700001)(8936002)(8676002)(66556008)(66476007)(6666004)(66946007)(316002)(966005)(54906003)(5660300002)(83380400001)(6486002)(36756003)(45080400002)(2906002)(26005)(478600001)(6512007)(186003)(1076003)(6506007)(2616005)(86362001)(38100700002);DIR:OUT;SFP:1101; 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Fix the issue by using the mid->vm_pgoff value for this merge case (aka case 8). Note that this does not change case 3's vm_pgoff as next and mid are the same VMA. Reported-by: Sanan Hasanov Link: https://lore.kernel.org/linux-mm/IA1PR07MB983017D2FBA174D2FF78CEB6ABCE9@IA1PR07MB9830.namprd07.prod.outlook.com/ Cc: Matthew Wilcox Cc: David Hildenbrand Cc: Hugh Dickins Signed-off-by: Liam R. Howlett Acked-by: David Hildenbrand --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mmap.c b/mm/mmap.c index 00d90bbc250e..614ea2d93b0a 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -978,7 +978,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm, vma = next; /* case 3 */ vma_start = addr; vma_end = next->vm_end; - vma_pgoff = next->vm_pgoff; + vma_pgoff = mid->vm_pgoff; err = 0; if (mid != next) { /* case 8 */ remove = mid;