fs: remove the access_ok() check in ioctl_fiemap
access_ok just checks we are fed a proper user pointer. We also do that
in copy_to_user itself, so no need to do this early.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Link: https://lore.kernel.org/r/20200523073016.2944131-9-hch@lst.de
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ioctl.c b/fs/ioctl.c
index b16e962..d69786d 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -213,13 +213,9 @@ static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap)
fieinfo.fi_extents_max = fiemap.fm_extent_count;
fieinfo.fi_extents_start = ufiemap->fm_extents;
- if (fiemap.fm_extent_count != 0 &&
- !access_ok(fieinfo.fi_extents_start,
- fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
- return -EFAULT;
-
error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start,
fiemap.fm_length);
+
fiemap.fm_flags = fieinfo.fi_flags;
fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
