diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2025-07-07 14:46:22 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-24 08:56:28 +0200 |
| commit | e0f3c0867d7d231c70984f05c97752caacd0daba (patch) | |
| tree | 266a04e58c3fe83132c9c1b891d9cbfed609236f /kernel/bpf/helpers.c | |
| parent | a27e27eee313fe1c450b6af1e80e64412546cab4 (diff) | |
comedi: aio_iiro_16: Fix bit shift out of bounds
commit 66acb1586737a22dd7b78abc63213b1bcaa100e4 upstream.
When checking for a supported IRQ number, the following test is used:
if ((1 << it->options[1]) & 0xdcfc) {
However, `it->options[i]` is an unchecked `int` value from userspace, so
the shift amount could be negative or out of bounds. Fix the test by
requiring `it->options[1]` to be within bounds before proceeding with
the original test. Valid `it->options[1]` values that select the IRQ
will be in the range [1,15]. The value 0 explicitly disables the use of
interrupts.
Fixes: ad7a370c8be4 ("staging: comedi: aio_iiro_16: add command support for change of state detection")
Cc: stable@vger.kernel.org # 5.13+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20250707134622.75403-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/bpf/helpers.c')
0 files changed, 0 insertions, 0 deletions