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ZK2edsE705gtpr84zeNptwt1v8p8brYBR2ZCHn3YpqEBmdlYkCxVYmZFLeMWsejpufg2w/25aCDO3MdO0J7l4qjdcWXMaXOHEVUU8u915Mxp6ty21lcG+HlW8uJNXNqLnJrohboc+dUerFBDeqyil4qQBqIYXZBxtPOxX9gaftX9racZ/FWa7+xuTZWm+UDlcI6Q4acFNmi8DMdCd6MgxUrQQFu9NlGCN4lESVvo3qB8w9Sf1Qc3Do8zhxEK5HG5F1Qcw0t5WIKtdEkpe3xaKt4wDbKoKObClcxNDehTUC3NTqfdLibEZVkp5QoQg0UHfaal8E8Hg9ZXHPwuNzrJ2kPce4qGR9ne6OnIWhtu8jz8jTXtOYulbmFJQunD8e6Cl3284TIXRlqf/3zoXMDIMjyaNnxT18ooDbj838r1eYdYBLQw= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed Jan 22, 2025 at 1:11 AM EST, Liu Shixin wrote: > I found a NULL pointer dereference as followed: > > BUG: kernel NULL pointer dereference, address: 0000000000000028 > #PF: supervisor read access in kernel mode > #PF: error_code(0x0000) - not-present page > PGD 0 P4D 0 > Oops: Oops: 0000 [#1] SMP PTI > CPU: 5 UID: 0 PID: 5964 Comm: sh Kdump: loaded Not tainted 6.13.0-dirty = #20 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubun= tu1. > RIP: 0010:has_unmovable_pages+0x184/0x360 > ... > Call Trace: > > set_migratetype_isolate+0xd1/0x180 > start_isolate_page_range+0xd2/0x170 > alloc_contig_range_noprof+0x101/0x660 > alloc_contig_pages_noprof+0x238/0x290 > alloc_gigantic_folio.isra.0+0xb6/0x1f0 > only_alloc_fresh_hugetlb_folio.isra.0+0xf/0x60 > alloc_pool_huge_folio+0x80/0xf0 > set_max_huge_pages+0x211/0x490 > __nr_hugepages_store_common+0x5f/0xe0 > nr_hugepages_store+0x77/0x80 > kernfs_fop_write_iter+0x118/0x200 > vfs_write+0x23c/0x3f0 > ksys_write+0x62/0xe0 > do_syscall_64+0x5b/0x170 > entry_SYSCALL_64_after_hwframe+0x76/0x7e > > As has_unmovable_pages() call folio_hstate() without hugetlb_lock, there > is a race to free the HugeTLB page between PageHuge() and folio_hstate(). > There is no need to add hugetlb_lock here as the HugeTLB page can be free= d > in lot of places. So it's enough to unfold folio_hstate() and add a check > to avoid NULL pointer dereference for hugepage_migration_supported(). > > Fixes: 464c7ffbcb16 ("mm/hugetlb: filter out hugetlb pages if HUGEPAGE mi= gration is not supported.") > Signed-off-by: Liu Shixin > --- > mm/page_isolation.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > Thanks. Acked-by: Zi Yan --=20 Best Regards, Yan, Zi