Based on the provided code slice and the information about the vulnerability, here are five possible patches to address the CWE-787 (Out-of-bounds Write) vulnerability between lines 9 and 12:

Patch 1:
```patch
9 	netfs_clear_inode_writeback(inode, &version);
+ 	if (inode->i_data.nrpages > 0) {
10 		clear_inode(inode);
11 		filemap_fdatawrite(&inode->i_data);
+ 	}
```

Patch 2:
```patch
9 	netfs_clear_inode_writeback(inode, &version);
+ 	if (inode && inode->i_data.nrpages > 0) {
10 		clear_inode(inode);
11 		filemap_fdatawrite(&inode->i_data);
+ 	}
```

Patch 3:
```patch
9 	netfs_clear_inode_writeback(inode, &version);
10 	clear_inode(inode);
- 	filemap_fdatawrite(&inode->i_data);
+ 	if (inode && inode->i_data.nrpages > 0) {
+ 		filemap_fdatawrite(&inode->i_data);
+ 	}
```

Patch 4:
```patch
9 	netfs_clear_inode_writeback(inode, &version);
10 	clear_inode(inode);
- 	filemap_fdatawrite(&inode->i_data);
+ 	if (inode && inode->i_mapping) {
+ 		filemap_fdatawrite(inode->i_mapping);
+ 	}
```

Patch 5:
```patch
9 	netfs_clear_inode_writeback(inode, &version);
10 	clear_inode(inode);
- 	filemap_fdatawrite(&inode->i_data);
+ 	if (inode && S_ISREG(inode->i_mode)) {
+ 		filemap_fdatawrite(&inode->i_data);
+ 	}
```

These patches aim to prevent potential out-of-bounds write operations by adding checks before performing the `filemap_fdatawrite` operation. Each patch provides a different approach to ensure that the operation is only performed when it's safe to do so.