[PATCH 5.15 135/172] vt_ioctl: add array_index_nospec to VT_ACTIVATE

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From: Jakob Koschel <jakobkoschel@xxxxxxxxx>

commit 28cb138f559f8c1a1395f5564f86b8bbee83631b upstream.

in vt_setactivate an almost identical code path has been patched
with array_index_nospec. In the VT_ACTIVATE path the user input
is from a system call argument instead of a usercopy.
For consistency both code paths should have the same mitigations
applied.

Kasper Acknowledgements: Jakob Koschel, Brian Johannesmeyer, Kaveh
Razavi, Herbert Bos, Cristiano Giuffrida from the VUSec group at VU
Amsterdam.

Co-developed-by: Brian Johannesmeyer <bjohannesmeyer@xxxxxxxxx>
Signed-off-by: Brian Johannesmeyer <bjohannesmeyer@xxxxxxxxx>
Signed-off-by: Jakob Koschel <jakobkoschel@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220127144406.3589293-2-jakobkoschel@xxxxxxxxx
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/tty/vt/vt_ioctl.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/tty/vt/vt_ioctl.c
+++ b/drivers/tty/vt/vt_ioctl.c
@@ -845,6 +845,7 @@ int vt_ioctl(struct tty_struct *tty,
 			return -ENXIO;
 
 		arg--;
+		arg = array_index_nospec(arg, MAX_NR_CONSOLES);
 		console_lock();
 		ret = vc_allocate(arg);
 		console_unlock();





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