eCryptfs: fix data types

Update data types and add casts in order to avoid potential overflow
issues.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 21 insertions, 16 deletions

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 26070d69e59a..9408ea484164 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -149,7 +149,7 @@ out:
  * ecryptfs_derive_iv
  * @iv: destination for the derived iv vale
  * @crypt_stat: Pointer to crypt_stat struct for the current inode
- * @offset: Offset of the page whose's iv we are to derive
+ * @offset: Offset of the extent whose IV we are to derive
  *
  * Generate the initialization vector from the given root IV and page
  * offset.
@@ -157,7 +157,7 @@ out:
  * Returns zero on success; non-zero on error.
  */
 static int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
-                              pgoff_t offset)
+                              loff_t offset)
 {
         int rc = 0;
         char dst[MD5_DIGEST_SIZE];
@@ -173,7 +173,7 @@ static int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
          * hashing business. -Halcrow */
         memcpy(src, crypt_stat->root_iv, crypt_stat->iv_bytes);
         memset((src + crypt_stat->iv_bytes), 0, 16);
-        snprintf((src + crypt_stat->iv_bytes), 16, "%ld", offset);
+        snprintf((src + crypt_stat->iv_bytes), 16, "%lld", offset);
         if (unlikely(ecryptfs_verbosity > 0)) {
                 ecryptfs_printk(KERN_DEBUG, "source:\n");
                 ecryptfs_dump_hex(src, (crypt_stat->iv_bytes + 16));
@@ -497,11 +497,11 @@ static int ecryptfs_encrypt_extent(struct page *enc_extent_page,
                                    struct page *page,
                                    unsigned long extent_offset)
 {
-        unsigned long extent_base;
+        loff_t extent_base;
         char extent_iv[ECRYPTFS_MAX_IV_BYTES];
         int rc;
 
-        extent_base = (page->index
+        extent_base = (((loff_t)page->index)
                        * (PAGE_CACHE_SIZE / crypt_stat->extent_size));
         rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
                                 (extent_base + extent_offset));
@@ -605,8 +605,9 @@ int ecryptfs_encrypt_page(struct page *page)
                         goto out;
                 }
                 ecryptfs_lower_offset_for_extent(
-                        &offset, ((page->index * (PAGE_CACHE_SIZE
-                                                  / crypt_stat->extent_size))
+                        &offset, ((((loff_t)page->index)
+                                   * (PAGE_CACHE_SIZE
+                                      / crypt_stat->extent_size))
                                   + extent_offset), crypt_stat);
                 rc = ecryptfs_write_lower(ecryptfs_inode, enc_extent_virt,
                                           offset, crypt_stat->extent_size);
@@ -628,11 +629,11 @@ static int ecryptfs_decrypt_extent(struct page *page,
                                    struct page *enc_extent_page,
                                    unsigned long extent_offset)
 {
-        unsigned long extent_base;
+        loff_t extent_base;
         char extent_iv[ECRYPTFS_MAX_IV_BYTES];
         int rc;
 
-        extent_base = (page->index
+        extent_base = (((loff_t)page->index)
                        * (PAGE_CACHE_SIZE / crypt_stat->extent_size));
         rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
                                 (extent_base + extent_offset));
@@ -1471,7 +1472,7 @@ ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat,
         while (current_header_page < header_pages) {
                 loff_t offset;
 
-                offset = (current_header_page << PAGE_CACHE_SHIFT);
+                offset = (((loff_t)current_header_page) << PAGE_CACHE_SHIFT);
                 if ((rc = ecryptfs_write_lower(ecryptfs_dentry->d_inode,
                                                page_virt, offset,
                                                PAGE_CACHE_SIZE))) {
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 9bc707df3b60..6ae0afb238d1 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -286,7 +286,8 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page,
         int rc = 0;
 
         while (extent_num_in_page < num_extents_per_page) {
-                loff_t view_extent_num = ((page->index * num_extents_per_page)
+                loff_t view_extent_num = ((((loff_t)page->index)
+                                           * num_extents_per_page)
                                           + extent_num_in_page);
 
                 if (view_extent_num < crypt_stat->num_header_extents_at_front) {
@@ -706,7 +707,7 @@ static int ecryptfs_commit_write(struct file *file, struct page *page,
                                 "index [0x%.16x])\n", page->index);
                 goto out;
         }
-        pos = (page->index << PAGE_CACHE_SHIFT) + to;
+        pos = (((loff_t)page->index) << PAGE_CACHE_SHIFT) + to;
         if (pos > i_size_read(ecryptfs_inode)) {
                 i_size_write(ecryptfs_inode, pos);
                 ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index ccd2599e0a4f..272eaeb9a738 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -87,7 +87,8 @@ int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
         loff_t offset;
         int rc;
 
-        offset = (page_for_lower->index << PAGE_CACHE_SHIFT) + offset_in_page;
+        offset = ((((off_t)page_for_lower->index) << PAGE_CACHE_SHIFT)
+                  + offset_in_page);
         virt = kmap(page_for_lower);
         rc = ecryptfs_write_lower(ecryptfs_inode, virt, offset, size);
         kunmap(page_for_lower);
@@ -117,7 +118,8 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
 {
         struct page *ecryptfs_page;
         char *ecryptfs_page_virt;
-        u64 ecryptfs_file_size = i_size_read(ecryptfs_file->f_dentry->d_inode);
+        loff_t ecryptfs_file_size =
+                i_size_read(ecryptfs_file->f_dentry->d_inode);
         loff_t data_offset = 0;
         loff_t pos;
         int rc = 0;
@@ -277,7 +279,7 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
         loff_t offset;
         int rc;
 
-        offset = ((page_index << PAGE_CACHE_SHIFT) + offset_in_page);
+        offset = ((((loff_t)page_index) << PAGE_CACHE_SHIFT) + offset_in_page);
         virt = kmap(page_for_ecryptfs);
         rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);
         kunmap(page_for_ecryptfs);
@@ -306,7 +308,8 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
 {
         struct page *ecryptfs_page;
         char *ecryptfs_page_virt;
-        u64 ecryptfs_file_size = i_size_read(ecryptfs_file->f_dentry->d_inode);
+        loff_t ecryptfs_file_size =
+                i_size_read(ecryptfs_file->f_dentry->d_inode);
         loff_t data_offset = 0;
         loff_t pos;
         int rc = 0;