ext4: in ext4_seek_{hole,data}, return -ENXIO for negative offsets

In the ext4 implementations of SEEK_HOLE and SEEK_DATA, make sure we
return -ENXIO for negative offsets instead of banging around inside
the extent code and returning -EFSCORRUPTED.

Reported-by: Mateusz S <muttdini@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org # 4.6

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 0d7cf0cc9b87562bbc52b17224794d9147208910..86ea1d92839aac834e51b2e29d943c6f6abc2867 100644 (file)
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -595,7 +595,7 @@ static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
        inode_lock(inode);
 
        isize = i_size_read(inode);
-       if (offset >= isize) {
+       if (offset < 0 || offset >= isize) {
                inode_unlock(inode);
                return -ENXIO;
        }
@@ -658,7 +658,7 @@ static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
        inode_lock(inode);
 
        isize = i_size_read(inode);
-       if (offset >= isize) {
+       if (offset < 0 || offset >= isize) {
                inode_unlock(inode);
                return -ENXIO;
        }