Fix a check in block_page_mkwrite meant to determine whether an offset is within the inode size. This error has spread to several filesystems and to iomap_page_mkwrite, so fix those instances as well. Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx> --- This patch has a trivial conflict with commit "iomap: Fix overflow in iomap_page_mkwrite" in Darrick's iomap pull request for 5.5: https://lore.kernel.org/lkml/20191125190907.GN6219@magnolia/ --- fs/buffer.c | 2 +- fs/ceph/addr.c | 2 +- fs/ext4/inode.c | 2 +- fs/f2fs/file.c | 2 +- fs/iomap/buffered-io.c | 2 +- fs/ubifs/file.c | 2 +- 6 files changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index 86a38b979323..152d391858d4 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2465,7 +2465,7 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, lock_page(page); size = i_size_read(inode); if ((page->mapping != inode->i_mapping) || - (page_offset(page) > size)) { + (page_offset(page) >= size)) { /* We overload EFAULT to mean page got truncated */ ret = -EFAULT; goto out_unlock; diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 7ab616601141..9fa0729ece41 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -1575,7 +1575,7 @@ static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) do { lock_page(page); - if ((off > size) || (page->mapping != inode->i_mapping)) { + if ((off >= size) || (page->mapping != inode->i_mapping)) { unlock_page(page); ret = VM_FAULT_NOPAGE; break; diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 516faa280ced..6dd4efe2fb63 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -6224,7 +6224,7 @@ vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf) lock_page(page); size = i_size_read(inode); /* Page got truncated from under us? */ - if (page->mapping != mapping || page_offset(page) > size) { + if (page->mapping != mapping || page_offset(page) >= size) { unlock_page(page); ret = VM_FAULT_NOPAGE; goto out; diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 29bc0a542759..3436be01af45 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -71,7 +71,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) down_read(&F2FS_I(inode)->i_mmap_sem); lock_page(page); if (unlikely(page->mapping != inode->i_mapping || - page_offset(page) > i_size_read(inode) || + page_offset(page) >= i_size_read(inode) || !PageUptodate(page))) { unlock_page(page); err = -EFAULT; diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index e25901ae3ff4..d454dbab5133 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1041,7 +1041,7 @@ vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops) lock_page(page); size = i_size_read(inode); if ((page->mapping != inode->i_mapping) || - (page_offset(page) > size)) { + (page_offset(page) >= size)) { /* We overload EFAULT to mean page got truncated */ ret = -EFAULT; goto out_unlock; diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c index cd52585c8f4f..ca0148ec77e6 100644 --- a/fs/ubifs/file.c +++ b/fs/ubifs/file.c @@ -1564,7 +1564,7 @@ static vm_fault_t ubifs_vm_page_mkwrite(struct vm_fault *vmf) lock_page(page); if (unlikely(page->mapping != inode->i_mapping || - page_offset(page) > i_size_read(inode))) { + page_offset(page) >= i_size_read(inode))) { /* Page got truncated out from underneath us */ goto sigbus; } -- 2.20.1
