| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.18 131/231] drm/amd/pm: Prevent divide by zero | Date | Tue, 19 Jul 2022 13:53:36 +0200 |
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From: Yefim Barashkin <mr.b34r@kolabnow.com>
[ Upstream commit 0638c98c17aa12fe914459c82cd178247e21fb2b ]
divide error: 0000 [#1] SMP PTI CPU: 3 PID: 78925 Comm: tee Not tainted 5.15.50-1-lts #1 Hardware name: MSI MS-7A59/Z270 SLI PLUS (MS-7A59), BIOS 1.90 01/30/2018 RIP: 0010:smu_v11_0_set_fan_speed_rpm+0x11/0x110 [amdgpu]
Speed is user-configurable through a file. I accidentally set it to zero, and the driver crashed.
Reviewed-by: Evan Quan <evan.quan@amd.com> Reviewed-by: André Almeida <andrealmeid@igalia.com> Signed-off-by: Yefim Barashkin <mr.b34r@kolabnow.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c index 5f8809f6990d..2fbd2926a531 100644 --- a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c +++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c @@ -1228,6 +1228,8 @@ int smu_v11_0_set_fan_speed_rpm(struct smu_context *smu, uint32_t crystal_clock_freq = 2500; uint32_t tach_period; + if (speed == 0) + return -EINVAL; /* * To prevent from possible overheat, some ASICs may have requirement * for minimum fan speed: -- 2.35.1
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