In the Linux kernel, the following vulnerability has been resolved:

Input: iforce - bound the device-reported force-feedback effect index

iforce_process_packet() handles a status report (packet id 0x02) by
taking a force-feedback effect index straight from the device wire and
using it to address the per-effect state array:

	i = data[1] & 0x7f;
	if (data[1] & 0x80) {
		if (!test_and_set_bit(FF_CORE_IS_PLAYED,
				      iforce->core_effects[i].flags))
			...
	} else if (test_and_clear_bit(FF_CORE_IS_PLAYED,
				      iforce->core_effects[i].flags)) {
		...
	}

The index is masked only with 0x7f, so it ranges 0..127, but
core_effects[] holds only IFORCE_EFFECTS_MAX (32) entries.  For an index
of 32..127 the test_and_set_bit()/test_and_clear_bit() is an
out-of-bounds single-bit read-modify-write past the array.  core_effects[]
is the second-to-last member of struct iforce, so the write lands in the
trailing members and beyond the embedding kzalloc()'d iforce_serio /
iforce_usb object.

data[1] is unvalidated device payload on both transports (the USB
interrupt endpoint and serio), and the status path is not gated on force
feedback being present, so a malicious or counterfeit device can set or
clear a bit at an attacker-chosen offset past the object.

Reject an out-of-range index instead of indexing with it.  Bound against
the array dimension IFORCE_EFFECTS_MAX rather than dev->ff->max_effects so
the check guarantees memory safety regardless of how many effects the
device registered.  A legitimate "effect started/stopped" status always
carries an index below IFORCE_EFFECTS_MAX, so well-formed devices are
unaffected; the neighbouring mark_core_as_ready() loop is already bounded
and is left untouched.

https://git.kernel.org/stable/c/0e9943d2e4c63496b6ca84bc66fd3c71d40558e2

https://git.kernel.org/stable/c/6c0f2901c9d325d4a0574c4237fd507810d225ff

https://git.kernel.org/stable/c/70019779325f2bb5f5a4098e91e79c655f50fcef

https://git.kernel.org/stable/c/a40250f97c312e000e3616c9074022311a0efbc3

https://git.kernel.org/stable/c/b1b79e89bc33e4c682d3df7ae2aadc62b5a0c310

https://git.kernel.org/stable/c/c21295616a8a52b9a5f18cd4ca8c73030eda3d4f

https://git.kernel.org/stable/c/d10b0507fa0f5b46764b178e3271f9012f2df677

https://git.kernel.org/stable/c/e5fa31f0550b55d80045669ae9080dd5b88abffa

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