linux-kernel - [PATCH] HID: amd_sfh: Increase bitwidth to avoid shift-out-of-bounds

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Message-Id: <20230704081724.2308195-1-kai.heng.feng@canonical.com>
Date:   Tue,  4 Jul 2023 16:17:21 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     basavaraj.natikar@....com
Cc:     mario.limonciello@....com,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] HID: amd_sfh: Increase bitwidth to avoid shift-out-of-bounds

UBSAN complains shift-out-of-bounds on amd_sfh:
[    7.593412] input: SYNA3105:00 06CB:CEA3 Mouse as /devices/platform/AMDI0010:00/i2c-0/i2c-SYNA3105:00/0018:06CB:CEA3.0001/input/input11
[    7.593541] input: SYNA3105:00 06CB:CEA3 Touchpad as /devices/platform/AMDI0010:00/i2c-0/i2c-SYNA3105:00/0018:06CB:CEA3.0001/input/input12
[    7.593625] hid-multitouch 0018:06CB:CEA3.0001: input,hidraw0: I2C HID v1.00 Mouse [SYNA3105:00 06CB:CEA3] on i2c-SYNA3105:00
[    7.664537] ================================================================================
[    7.664540] UBSAN: shift-out-of-bounds in drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_desc.c:149:50
[    7.664544] shift exponent 103 is too large for 64-bit type 'long unsigned int'
[    7.664547] CPU: 5 PID: 124 Comm: kworker/5:1 Tainted: G        W          6.4.0-next-20230703 #1
[    7.664549] Hardware name: HP HP EliteBook 835 13 inch G10 Notebook PC/8C10, BIOS V83 Ver. 01.01.09 06/05/2023
[    7.664551] Workqueue: events amd_sfh_work_buffer [amd_sfh]
[    7.664562] Call Trace:
[    7.664564]  <TASK>
[    7.664567]  dump_stack_lvl+0x48/0x70
[    7.664576]  dump_stack+0x10/0x20
[    7.664578]  __ubsan_handle_shift_out_of_bounds+0x156/0x310
[    7.664584]  ? sched_clock_noinstr+0x9/0x10
[    7.664589]  ? sched_clock_cpu+0x12/0x1d0
[    7.664594]  ? raw_spin_rq_lock_nested+0x1e/0xa0
[    7.664597]  ? psi_group_change+0x237/0x520
[    7.664600]  float_to_int.cold+0x18/0xcf [amd_sfh]
[    7.664606]  ? __pfx_get_input_rep+0x10/0x10 [amd_sfh]
[    7.664611]  get_input_rep+0x241/0x340 [amd_sfh]
[    7.664617]  amd_sfh_work_buffer+0x91/0x190 [amd_sfh]
[    7.664622]  process_one_work+0x229/0x450
[    7.664627]  worker_thread+0x50/0x3f0
[    7.664629]  ? __pfx_worker_thread+0x10/0x10
[    7.664632]  kthread+0xf4/0x130
[    7.664635]  ? __pfx_kthread+0x10/0x10
[    7.664638]  ret_from_fork+0x29/0x50
[    7.664644]  </TASK>
[    7.664652] ================================================================================

So increase the variable bitwidth to solve the issue.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_desc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_desc.c b/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_desc.c
index 6f0d332ccf51..550639ef8bfe 100644
--- a/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_desc.c
+++ b/drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_desc.c
@@ -134,7 +134,8 @@ static void get_common_inputs(struct common_input_property *common, int report_i
 
 static int float_to_int(u32 float32)
 {
-	int fraction, shift, mantissa, sign, exp, zeropre;
+	int fraction, shift, sign, exp, zeropre;
+	s128 mantissa;
 
 	mantissa = float32 & GENMASK(22, 0);
 	sign = (float32 & BIT(31)) ? -1 : 1;
-- 
2.34.1