[PATCH] drm/amd/pm: Handle non-terminated overdrive commands.

[Bas Nieuwenhuizen]

The incoming strings might not be terminated by a newline
or a 0.

(found while testing a program that just wrote the string
 itself, causing a crash)

Cc: sta...@vger.kernel.org
Fixes: e3933f26b657 ("drm/amd/pp: Add edit/commit/show OD clock/voltage support 
in sysfs")
Signed-off-by: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
---
 drivers/gpu/drm/amd/pm/amdgpu_pm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c 
b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index da0da03569e8..f9c9eba1a815 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -760,7 +760,7 @@ static ssize_t amdgpu_set_pp_od_clk_voltage(struct device 
*dev,
        if (adev->in_suspend && !adev->in_runpm)
                return -EPERM;
 
-       if (count > 127)
+       if (count > 127 || count == 0)
                return -EINVAL;
 
        if (*buf == 's')
@@ -780,7 +780,8 @@ static ssize_t amdgpu_set_pp_od_clk_voltage(struct device 
*dev,
        else
                return -EINVAL;
 
-       memcpy(buf_cpy, buf, count+1);
+       memcpy(buf_cpy, buf, count);
+       buf_cpy[count] = 0;
 
        tmp_str = buf_cpy;
 
@@ -797,6 +798,9 @@ static ssize_t amdgpu_set_pp_od_clk_voltage(struct device 
*dev,
                        return -EINVAL;
                parameter_size++;
 
+               if (!tmp_str)
+                       break;
+
                while (isspace(*tmp_str))
                        tmp_str++;
        }
-- 
2.42.0