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

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 0d7cf0cc9b87..86ea1d92839a 100644
--- 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;
         }