From: Denis Arefev <arefev@swemel.ru>
To: Kenneth Feng <kenneth.feng@amd.com>
Cc: "Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 3/5] drm/amd/pm: Prevent division by zero
Date: Fri, 21 Mar 2025 13:52:33 +0300 [thread overview]
Message-ID: <20250321105239.10096-4-arefev@swemel.ru> (raw)
In-Reply-To: <20250321105239.10096-1-arefev@swemel.ru>
The user can set any speed value.
If speed is greater than UINT_MAX/8, division by zero is possible.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 031db09017da ("drm/amd/powerplay/vega20: enable fan RPM and pwm settings V2")
Signed-off-by: Denis Arefev <arefev@swemel.ru>
---
drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c
index a3331ffb2daf..1b1c88590156 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/vega20_thermal.c
@@ -191,7 +191,7 @@ int vega20_fan_ctrl_set_fan_speed_rpm(struct pp_hwmgr *hwmgr, uint32_t speed)
uint32_t tach_period, crystal_clock_freq;
int result = 0;
- if (!speed)
+ if (!speed || speed > UINT_MAX/8)
return -EINVAL;
if (PP_CAP(PHM_PlatformCaps_MicrocodeFanControl)) {
--
2.43.0
next prev parent reply other threads:[~2025-03-21 10:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-21 10:52 [PATCH 0/5] " Denis Arefev
2025-03-21 10:52 ` [PATCH 1/5] " Denis Arefev
2025-03-21 10:52 ` [PATCH 2/5] " Denis Arefev
2025-03-21 10:52 ` Denis Arefev [this message]
2025-03-21 13:40 ` [PATCH 0/5] " Alex Deucher
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