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| author | Kinglong Mee <kinglongmee@gmail.com> | 2017-03-13 16:35:13 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-03-21 22:34:31 -0400 |
| commit | a83d50bc16c4f5d0a359790015b5b32f3f0e52db (patch) | |
| tree | 47ea751a5e2adbe77678f677bd159dd7df53dd23 /fs/f2fs/data.c | |
| parent | bd4667cb4b77f02a16dd14443ba66884d755c7e6 (diff) | |
| download | lwn-a83d50bc16c4f5d0a359790015b5b32f3f0e52db.tar.gz lwn-a83d50bc16c4f5d0a359790015b5b32f3f0e52db.zip | |
f2fs: fix bad prefetchw of NULL page
For f2fs_read_data_pages, the f2fs_mpage_readpages gets "page == NULL",
so that, the prefetchw(&page->flags) is operated on NULL.
Fixes: f1e8866016 ("f2fs: expose f2fs_mpage_readpages")
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/data.c')
| -rw-r--r-- | fs/f2fs/data.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index e341d446205a..2c8485bb6eb1 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1151,9 +1151,10 @@ static int f2fs_mpage_readpages(struct address_space *mapping, for (page_idx = 0; nr_pages; page_idx++, nr_pages--) { - prefetchw(&page->flags); if (pages) { page = list_last_entry(pages, struct page, lru); + + prefetchw(&page->flags); list_del(&page->lru); if (add_to_page_cache_lru(page, mapping, page->index, |