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| author | Chao Yu <yuchao0@huawei.com> | 2019-11-07 12:29:00 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2019-11-07 22:17:39 +0300 |
| commit | 1f0d5c911b64165c9754139a26c8c2fad352c132 (patch) | |
| tree | 0df6533d246f5da2285b26353c0dd277f4493bdd /fs/f2fs/data.c | |
| parent | 2a60637f06ac94869b2e630eaf837110d39bf291 (diff) | |
| download | linux-1f0d5c911b64165c9754139a26c8c2fad352c132.tar.xz | |
f2fs: fix potential overflow
We expect 64-bit calculation result from below statement, however
in 32-bit machine, looped left shift operation on pgoff_t type
variable may cause overflow issue, fix it by forcing type cast.
page->index << PAGE_SHIFT;
Fixes: 26de9b117130 ("f2fs: avoid unnecessary updating inode during fsync")
Fixes: 0a2aa8fbb969 ("f2fs: refactor __exchange_data_block for speed up")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/data.c')
| -rw-r--r-- | fs/f2fs/data.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index ba3bcf4c7889..8a80fc86a44f 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2203,7 +2203,7 @@ static int __write_data_page(struct page *page, bool *submitted, loff_t i_size = i_size_read(inode); const pgoff_t end_index = ((unsigned long long) i_size) >> PAGE_SHIFT; - loff_t psize = (page->index + 1) << PAGE_SHIFT; + loff_t psize = (loff_t)(page->index + 1) << PAGE_SHIFT; unsigned offset = 0; bool need_balance_fs = false; int err = 0; |