Message ID | 20230327185532.2354250-3-Liam.Howlett@oracle.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Howlett" <Liam.Howlett@oracle.com> To: Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Matthew Wilcox <willy@infradead.org>, Suren Baghdasaryan <surenb@google.com> Cc: "Liam R. Howlett" <Liam.Howlett@Oracle.com>, Stable@vger.kernel.org, "Liam R . Howlett" <Liam.Howlett@oracle.com> Subject: [PATCH 2/8] maple_tree: detect dead nodes in mas_start() Date: Mon, 27 Mar 2023 14:55:26 -0400 Message-Id: <20230327185532.2354250-3-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230327185532.2354250-1-Liam.Howlett@oracle.com> References: <20230327185532.2354250-1-Liam.Howlett@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: YT1P288CA0022.CANP288.PROD.OUTLOOK.COM (2603:10b6:b01::35) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|PH7PR10MB5722:EE_ X-MS-Office365-Filtering-Correlation-Id: c7a2b980-3f92-4ed9-5406-08db2ef4dc98 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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Fix VMA tree modification under mmap read lock
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expand
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diff --git a/lib/maple_tree.c b/lib/maple_tree.c index cc356b8369ad..089cd76ec379 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -1360,12 +1360,16 @@ static inline struct maple_enode *mas_start(struct ma_state *mas) mas->max = ULONG_MAX; mas->depth = 0; +retry: root = mas_root(mas); /* Tree with nodes */ if (likely(xa_is_node(root))) { mas->depth = 1; mas->node = mte_safe_root(root); mas->offset = 0; + if (mte_dead_node(mas->node)) + goto retry; + return NULL; }