| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.13 037/109] ext4: in ext4_seek_{hole,data}, return -ENXIO for negative offsets | Date | Sun, 24 Sep 2017 22:32:58 +0200 |
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4.13-stable review patch. If anyone has any objections, please let me know.
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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 @@ -595,7 +595,7 @@ 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; } @@ -658,7 +658,7 @@ 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; }
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