[v3,02/11] VFS copy_file_range check validity of input source offset

Message ID 20181025215147.36248-4-olga.kornievskaia@gmail.com
State New
Headers show
Series
  • client-side support for "inter" SSC copy
Related show

Commit Message

Olga Kornievskaia Oct. 25, 2018, 9:51 p.m.
From: Olga Kornievskaia <kolga@netapp.com>

Input source offset can't be beyond the end of the file.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/read_write.c | 3 +++
 1 file changed, 3 insertions(+)

Patch

diff --git a/fs/read_write.c b/fs/read_write.c
index fb4ffca..72b2c74 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1594,6 +1594,9 @@  ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
 		}
 	}
 
+	if (pos_in > i_size_read(inode_in))
+		return -EINVAL;
+
 	if (file_out->f_op->copy_file_range) {
 		ret = file_out->f_op->copy_file_range(file_in, pos_in, file_out,
 						      pos_out, len, flags);