summaryrefslogtreecommitdiff
path: root/fs/read_write.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index da6de12b5c46..7537b6b6b5a2 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1669,6 +1669,9 @@ static int clone_verify_area(struct file *file, loff_t pos, u64 len, bool write)
* Check that the two inodes are eligible for cloning, the ranges make
* sense, and then flush all dirty data. Caller must ensure that the
* inodes have been locked against any other modifications.
+ *
+ * Returns: 0 for "nothing to clone", 1 for "something to clone", or
+ * the usual negative error code.
*/
int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in,
struct inode *inode_out, loff_t pos_out,
@@ -1695,17 +1698,15 @@ int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in,
/* Are we going all the way to the end? */
isize = i_size_read(inode_in);
- if (isize == 0) {
- *len = 0;
+ if (isize == 0)
return 0;
- }
/* Zero length dedupe exits immediately; reflink goes to EOF. */
if (*len == 0) {
- if (is_dedupe) {
- *len = 0;
+ if (is_dedupe || pos_in == isize)
return 0;
- }
+ if (pos_in > isize)
+ return -EINVAL;
*len = isize - pos_in;
}
@@ -1769,7 +1770,7 @@ int vfs_clone_file_prep_inodes(struct inode *inode_in, loff_t pos_in,
return -EBADE;
}
- return 0;
+ return 1;
}
EXPORT_SYMBOL(vfs_clone_file_prep_inodes);
@@ -1955,6 +1956,9 @@ int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
goto out;
ret = 0;
+ if (off + len > i_size_read(src))
+ return -EINVAL;
+
/* pre-format output fields to sane values */
for (i = 0; i < count; i++) {
same->info[i].bytes_deduped = 0ULL;