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fs: remove the access_ok() check in ioctl_fiemap

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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>
This commit is contained in:
Christoph Hellwig 2020-05-23 09:30:15 +02:00 committed by Theodore Ts'o
parent 45dd052e67
commit c7d216e8c4
1 changed files with 1 additions and 5 deletions
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6
fs/ioctl.c
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@ -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)))