4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
commit 1bd8d6cd3e413d64e543ec3e69ff43e75a1cf1ea upstream.
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@xxxxxxxxx>
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/file.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -527,7 +527,7 @@ static loff_t ext4_seek_data(struct file
inode_lock(inode);
isize = i_size_read(inode);
- if (offset >= isize) {
+ if (offset < 0 || offset >= isize) {
inode_unlock(inode);
return -ENXIO;
}
@@ -590,7 +590,7 @@ static loff_t ext4_seek_hole(struct file
inode_lock(inode);
isize = i_size_read(inode);
- if (offset >= isize) {
+ if (offset < 0 || offset >= isize) {
inode_unlock(inode);
return -ENXIO;
}