[PATCH 4.14 60/74] fix compat handling of FICLONERANGE, FIDEDUPERANGE and FS_IOC_FIEMAP

Greg Kroah-Hartman
2020-01-07T21:10:53Z

From: Al Viro <viro@zeniv.linux.org.uk>

commit 6b2daec19094a90435abe67d16fb43b1a5527254 upstream.

Unlike FICLONE, all of those take a pointer argument; they do need
compat_ptr() applied to arg.

Fixes: d79bdd52d8be ("vfs: wire up compat ioctl for CLONE/CLONE_RANGE")
Fixes: 54dbc1517237 ("vfs: hoist the btrfs deduplication ioctl to the vfs")
Fixes: ceac204e1da9 ("fs: make fiemap work from compat_ioctl")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/compat_ioctl.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -1577,9 +1577,10 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned i
#endif

case FICLONE:
+ goto do_ioctl;
case FICLONERANGE:
case FIDEDUPERANGE:
- goto do_ioctl;
+ goto found_handler;