vfs: Don't copy beyond the end of the file
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Message ID 20160907201031.27512-1-Anna.Schumaker@Netapp.com
State New
Headers show

Commit Message

Schumaker, Anna Sept. 7, 2016, 8:10 p.m. UTC
According to `man 2 copy_file_range`, EINVAL should be returned if the
"requested range extends beyond the end of the source file".  Falling
back on do_splice_direct() will return 0 in this case, so let's add an
explicit check to match the behavior documented in the man page.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
 fs/read_write.c | 3 +++
 1 file changed, 3 insertions(+)

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diff --git a/fs/read_write.c b/fs/read_write.c
index 66215a7..1cbab4e 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1497,6 +1497,9 @@  ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
 	if (unlikely(ret))
 		return ret;
+	if (pos_in >= i_size_read(inode_in))
+		return -EINVAL;
 	if (!(file_in->f_mode & FMODE_READ) ||
 	    !(file_out->f_mode & FMODE_WRITE) ||
 	    (file_out->f_flags & O_APPEND))