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| author | Chao Yu <yuchao0@huawei.com> | 2019-11-07 17:29:00 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-17 19:49:02 +0100 |
| commit | 382e63a560a6ef8588661ff0c0fd83baa1d7cfcd (patch) | |
| tree | cdc7e80e81c01407dcafb56c2ade461807ef779f /fs/f2fs/data.c | |
| parent | fe07c80f5eb7009675dfac58b9471d703432c315 (diff) | |
f2fs: fix potential overflow
commit 1f0d5c911b64165c9754139a26c8c2fad352c132 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 5755e897a5f0..2e9c73165800 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -2098,7 +2098,7 @@ 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; |