From: Chao Yu yuchao0@huawei.com
[ Upstream commit a9af3fdcc4258af406879eca63d82e9d6baa892e ]
In build_sit_entries(), if valid_blocks in SIT block is smaller than valid_blocks in journal, for below calculation:
sbi->discard_blks += old_valid_blocks - se->valid_blocks;
There will be two times potential overflow: - old_valid_blocks - se->valid_blocks will overflow, and be a very large number. - sbi->discard_blks += result will overflow again, comes out a correct result accidently.
Anyway, it should be fixed.
Fixes: d600af236da5 ("f2fs: avoid unneeded loop in build_sit_entries") Fixes: 1f43e2ad7bff ("f2fs: introduce CP_TRIMMED_FLAG to avoid unneeded discard") Signed-off-by: Chao Yu yuchao0@huawei.com Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/data.c | 2 +- fs/f2fs/file.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index ac3fa4bbed2d..afe7dcfff036 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1512,7 +1512,7 @@ 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; diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index a90173b856f6..d98acc20a38a 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1059,7 +1059,7 @@ static int __clone_blkaddrs(struct inode *src_inode, struct inode *dst_inode, } dn.ofs_in_node++; i++; - new_size = (dst + i) << PAGE_SHIFT; + new_size = (loff_t)(dst + i) << PAGE_SHIFT; if (dst_inode->i_size < new_size) f2fs_i_size_write(dst_inode, new_size); } while (--ilen && (do_replace[i] || blkaddr[i] == NULL_ADDR));