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| author | Ian Abbott <abbotti@mev.co.uk> | 2025-07-07 14:57:37 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-24 08:56:28 +0200 |
| commit | 3eab654f5d199ecd45403c6588cda63e491fcfca (patch) | |
| tree | c40c05e978166b2a4901dc6d97d08cb859068a7d /kernel/bpf/helpers.c | |
| parent | 076b13ee60eb01ed0d140ef261f95534562a3077 (diff) | |
comedi: das6402: Fix bit shift out of bounds
commit 70f2b28b5243df557f51c054c20058ae207baaac upstream.
When checking for a supported IRQ number, the following test is used:
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
if ((1 << it->options[1]) & 0x8cec) {
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: 79e5e6addbb1 ("staging: comedi: das6402: rewrite broken driver")
Cc: stable@vger.kernel.org # 5.13+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20250707135737.77448-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/bpf/helpers.c')
0 files changed, 0 insertions, 0 deletions