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Subject[PATCH 4.4 02/28] ext4: in ext4_seek_{hole,data}, return -ENXIO for negative offsets
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Darrick J. Wong <darrick.wong@oracle.com>

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@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/ext4/file.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -559,7 +559,7 @@ static loff_t ext4_seek_data(struct file
mutex_lock(&inode->i_mutex);

isize = i_size_read(inode);
- if (offset >= isize) {
+ if (offset < 0 || offset >= isize) {
mutex_unlock(&inode->i_mutex);
return -ENXIO;
}
@@ -632,7 +632,7 @@ static loff_t ext4_seek_hole(struct file
mutex_lock(&inode->i_mutex);

isize = i_size_read(inode);
- if (offset >= isize) {
+ if (offset < 0 || offset >= isize) {
mutex_unlock(&inode->i_mutex);
return -ENXIO;
}

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