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authorLinus Torvalds <torvalds@linux-foundation.org>2020-02-08 13:04:49 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-08 13:04:49 -0800
commit236f45329460f76d058111de1a1cea12f5a8b734 (patch)
treeca848d9200a3a785f6cbbbff2720a4ff021c5947 /fs/ioctl.c
parent995933305e11dc8698fdba249ca5f2d145b1d657 (diff)
parent12efec5602744c5a185049eb4fcfd9aebe01bd6f (diff)
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull misc vfs updates from Al Viro: - bmap series from cmaiolino - getting rid of convolutions in copy_mount_options() (use a couple of copy_from_user() instead of the __get_user() crap) * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: saner copy_mount_options() fibmap: Reject negative block numbers fibmap: Use bmap instead of ->bmap method in ioctl_fibmap ecryptfs: drop direct calls to ->bmap cachefiles: drop direct usage of ->bmap method. fs: Enable bmap() function to properly return errors
Diffstat (limited to 'fs/ioctl.c')
-rw-r--r--fs/ioctl.c33
1 files changed, 23 insertions, 10 deletions
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 7c9a5df5a597..72d6848fb6ad 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -54,19 +54,32 @@ EXPORT_SYMBOL(vfs_ioctl);
static int ioctl_fibmap(struct file *filp, int __user *p)
{
- struct address_space *mapping = filp->f_mapping;
- int res, block;
+ struct inode *inode = file_inode(filp);
+ int error, ur_block;
+ sector_t block;
- /* do we support this mess? */
- if (!mapping->a_ops->bmap)
- return -EINVAL;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
- res = get_user(block, p);
- if (res)
- return res;
- res = mapping->a_ops->bmap(mapping, block);
- return put_user(res, p);
+
+ error = get_user(ur_block, p);
+ if (error)
+ return error;
+
+ if (ur_block < 0)
+ return -EINVAL;
+
+ block = ur_block;
+ error = bmap(inode, &block);
+
+ if (error)
+ ur_block = 0;
+ else
+ ur_block = block;
+
+ if (put_user(ur_block, p))
+ error = -EFAULT;
+
+ return error;
}
/**