6.6-stable review patch. If anyone has any objections, please let me know.
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From: Denis Arefev arefev@swemel.ru
commit 7ba88b5cccc1a99c1afb96e31e7eedac9907704c upstream.
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: 1e866f1fe528 ("drm/amd/pm: Prevent divide by zero") Signed-off-by: Denis Arefev arefev@swemel.ru Signed-off-by: Alex Deucher alexander.deucher@amd.com (cherry picked from commit da7dc714a8f8e1c9fc33c57cd63583779a3bef71) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c +++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c @@ -1202,7 +1202,7 @@ int smu_v11_0_set_fan_speed_rpm(struct s uint32_t crystal_clock_freq = 2500; uint32_t tach_period;
- if (speed == 0) + if (!speed || speed > UINT_MAX/8) return -EINVAL; /* * To prevent from possible overheat, some ASICs may have requirement