2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Li Wang <[email protected]>

commit 684a3ff7e69acc7c678d1a1394fe9e757993fd34 upstream.

ecryptfs_write() can enter an infinite loop when truncating a file to a
size larger than 4G. This only happens on architectures where size_t is
represented by 32 bits.

This was caused by a size_t overflow due to it incorrectly being used to
store the result of a calculation which uses potentially large values of
type loff_t.

[[email protected]: rewrite subject and commit message]
Signed-off-by: Li Wang <[email protected]>
Signed-off-by: Yunchuan Wen <[email protected]>
Reviewed-by: Cong Wang <[email protected]>
Signed-off-by: Tyler Hicks <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 fs/ecryptfs/read_write.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -134,7 +134,7 @@ int ecryptfs_write(struct file *ecryptfs
                pgoff_t ecryptfs_page_idx = (pos >> PAGE_CACHE_SHIFT);
                size_t start_offset_in_page = (pos & ~PAGE_CACHE_MASK);
                size_t num_bytes = (PAGE_CACHE_SIZE - start_offset_in_page);
-               size_t total_remaining_bytes = ((offset + size) - pos);
+               loff_t total_remaining_bytes = ((offset + size) - pos);
 
                if (fatal_signal_pending(current)) {
                        rc = -EINTR;
@@ -145,7 +145,7 @@ int ecryptfs_write(struct file *ecryptfs
                        num_bytes = total_remaining_bytes;
                if (pos < offset) {
                        /* remaining zeros to write, up to destination offset */
-                       size_t total_remaining_zeros = (offset - pos);
+                       loff_t total_remaining_zeros = (offset - pos);
 
                        if (num_bytes > total_remaining_zeros)
                                num_bytes = total_remaining_zeros;


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