[PATCH v6 03/12] NFS: validity check for source offset in copy_file_range

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From: Olga Kornievskaia <kolga@xxxxxxxxxx>

Input source offset can not be beyond the end of the file.

Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
 fs/nfs/nfs4file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 5a73c90..7838bdf 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -135,6 +135,9 @@ static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
 {
 	ssize_t ret;
 
+	if (pos_in >= i_size_read(file_inode(file_in)))
+		return -EINVAL;
+
 	if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
 		return -EXDEV;
 
-- 
1.8.3.1




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