ntfs: fix kmap_local_page() usage in compress

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Several compressed I/O paths discard the address returned by
kmap_local_page() and later access or unmap the page using page_address().
This is invalid for highmem pages, and local mappings must also be unmapped
using the address returned by kmap_local_page().

Map each destination page in ntfs_decompress() only while producing the
current sub-block. Use memcpy_from_page(), memcpy_to_page(), and
memzero_page() for the other page accesses. Remove unnecessary local
mappings from ntfs_write_cb(), where pages are accessed through the vmap()
mapping.

Fixes: 495e90fa33 ("ntfs: update attrib operations")
Reported-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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Namjae Jeon 2026-06-15 21:07:19 +09:00

parent f6ce4cbcc5

commit 6e03fbd5f7

1 changed files with 15 additions and 23 deletions

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fs/ntfs/compress.c

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