The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 1bd8d6cd3e413d64e543ec3e69ff43e75a1cf1ea Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx> Date: Thu, 24 Aug 2017 13:22:06 -0400 Subject: [PATCH] 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@xxxxxxxxx> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx # 4.6 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; }