Message ID | 20230120162650.984577-7-Liam.Howlett@oracle.com (mailing list archive) |
---|---|
State | New |
Headers | show
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Howlett" <Liam.Howlett@oracle.com> To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, maple-tree@lists.infradead.org Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com>, syzbot+502859d610c661e56545@syzkaller.appspotmail.com Subject: [PATCH v4 06/49] maple_tree: Fix mas_prev() and mas_find() state handling Date: Fri, 20 Jan 2023 11:26:07 -0500 Message-Id: <20230120162650.984577-7-Liam.Howlett@oracle.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230120162650.984577-1-Liam.Howlett@oracle.com> References: <20230120162650.984577-1-Liam.Howlett@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: YT4PR01CA0098.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:d7::15) To SN6PR10MB3022.namprd10.prod.outlook.com (2603:10b6:805:d8::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN6PR10MB3022:EE_|IA1PR10MB6026:EE_ X-MS-Office365-Filtering-Correlation-Id: 2ead38aa-b4f5-4c7e-425f-08dafb0336b7 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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VMA tree type safety and remove __vma_adjust()
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diff --git a/lib/maple_tree.c b/lib/maple_tree.c index 14ce355e4149..43bbf1906571 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -4844,7 +4844,7 @@ static inline void *mas_prev_entry(struct ma_state *mas, unsigned long min) if (mas->index < min) { mas->index = mas->last = min; - mas_pause(mas); + mas->node = MAS_NONE; return NULL; } retry: @@ -5918,6 +5918,7 @@ void *mas_prev(struct ma_state *mas, unsigned long min) if (!mas->index) { /* Nothing comes before 0 */ mas->last = 0; + mas->node = MAS_NONE; return NULL; } @@ -6008,6 +6009,9 @@ void *mas_find(struct ma_state *mas, unsigned long max) mas->index = ++mas->last; } + if (unlikely(mas_is_none(mas))) + mas->node = MAS_START; + if (unlikely(mas_is_start(mas))) { /* First run or continue */ void *entry;
When mas_prev() does not find anything, set the state to MAS_NONE. Handle the MAS_NONE in mas_find() like a MAS_START. Reported-by: syzbot+502859d610c661e56545@syzkaller.appspotmail.com Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> --- lib/maple_tree.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)