From 872340aa041eb12c831abee7d26d8e8f685a6a70 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Thu, 7 Nov 2019 17:29:00 +0800 Subject: [PATCH] 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 Signed-off-by: Jaegeuk Kim Signed-off-by: Greg Kroah-Hartman --- 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)); -- 2.20.1