From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Thu, 24 Aug 2017 17:22:06 +0000 (-0400)
Subject: ext4: in ext4_seek_{hole,data}, return -ENXIO for negative offsets
X-Git-Tag: v4.14-rc1~134^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1bd8d6cd3e413d64e543ec3e69ff43e75a1cf1ea;p=platform%2Fkernel%2Flinux-exynos.git

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 0d7cf0c..86ea1d9 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;
 	}