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Mon, 26 Oct 2026 06:09:37 +0000 X-Mizu-Trace-ID: 68994bf62ca272a5 X-Migadu-Flow: FLOW_OUT From: Ye Liu Date: Mon, 26 Oct 2026 14:09:24 +0800 Subject: [PATCH 2/2] mm/vmalloc: warn on NULL page in remap_vmalloc_range_partial X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261026-vmalloc_remap-v1-2-b7a907814e90@linux.dev> References: <20261026-vmalloc_remap-v1-0-b7a907814e90@linux.dev> In-Reply-To: <20261026-vmalloc_remap-v1-0-b7a907814e90@linux.dev> To: Andrew Morton , Uladzislau Rezki Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ye Liu X-Mailer: b4 0.17-dev-39d60 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 5EEC080003 X-Stat-Signature: tr16a8cdpjzgk6c4sikgz8amiwqbnb31 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1792994978-569375 X-HE-Meta: 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 HHcbQcQ4 OBZuu+z4ubYzt3KiT4n2UbghMVwkEim1X19E6QUD+ONBnyquxQ9K12HrJZWeTzjdNWuQOMOWCU7ugyVyR8t17i8697NHRCT4Gbx0ItjYAKLKu+V7m9yzybkBdrHFy1IZv9DyWp2tFKbeNXDi6mtTZcNc79/hFHLv7ghMaV3YSOh8/kyeUHdtz2hMcmreXIQFFXx5VuGEAUJQ40QyLq8rHvpRAuudnmuNDIOi8/PRp1vhOAPRdXy0yuZCmr0BAKgtsCir2P6PTn0W7AhqMKTMfIrQo7A== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 From: Ye Liu remap_vmalloc_range_partial() oopses if vmalloc_to_page() returns NULL, which never happens today because VM_USERMAP areas keep every page mapped. Add a WARN_ON(!page) to flag a break before the oops. Signed-off-by: Ye Liu --- mm/vmalloc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index a888eca016a8..59ba203a4eff 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -4906,6 +4906,7 @@ int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr, struct page *page = vmalloc_to_page(kaddr); int ret; + WARN_ON(!page); ret = vm_insert_page(vma, uaddr, page); if (ret) return ret; -- 2.43.0