releases/4.4.93/ext4-in-ext4_seek_-hole-data-return-enxio-for-negative-offsets.patch

   1 From 1bd8d6cd3e413d64e543ec3e69ff43e75a1cf1ea Mon Sep 17 00:00:00 2001
   2 From: "Darrick J. Wong" <darrick.wong@oracle.com>
   3 Date: Thu, 24 Aug 2017 13:22:06 -0400
   4 Subject: ext4: in ext4_seek_{hole,data}, return -ENXIO for negative offsets
   5
   6 From: Darrick J. Wong <darrick.wong@oracle.com>
   7
   8 commit 1bd8d6cd3e413d64e543ec3e69ff43e75a1cf1ea upstream.
   9
  10 In the ext4 implementations of SEEK_HOLE and SEEK_DATA, make sure we
  11 return -ENXIO for negative offsets instead of banging around inside
  12 the extent code and returning -EFSCORRUPTED.
  13
  14 Reported-by: Mateusz S <muttdini@gmail.com>
  15 Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
  16 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18
  19 ---
  20  fs/ext4/file.c |    4 ++--
  21  1 file changed, 2 insertions(+), 2 deletions(-)
  22
  23 --- a/fs/ext4/file.c
  24 +++ b/fs/ext4/file.c
  25 @@ -559,7 +559,7 @@ static loff_t ext4_seek_data(struct file
  26         mutex_lock(&inode->i_mutex);
  27
  28         isize = i_size_read(inode);
  29 -       if (offset >= isize) {
  30 +       if (offset < 0 || offset >= isize) {
  31                 mutex_unlock(&inode->i_mutex);
  32                 return -ENXIO;
  33         }
  34 @@ -632,7 +632,7 @@ static loff_t ext4_seek_hole(struct file
  35         mutex_lock(&inode->i_mutex);
  36
  37         isize = i_size_read(inode);
  38 -       if (offset >= isize) {
  39 +       if (offset < 0 || offset >= isize) {
  40                 mutex_unlock(&inode->i_mutex);
  41                 return -ENXIO;
  42         }