If the user passes a "level" value which is higher than 31 then that
leads to shift wrapping. The undefined behavior will lead to a
syzkaller stack dump.
Fixes: 5632708f4452 ("drm/amd/powerplay: add dpm force multiple levels on cz/tonga/fiji/polaris (v2)")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
drivers/gpu/drm/amd/pm/amdgpu_pm.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index e9b569b76716..1a4010fcf561 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -1094,7 +1094,7 @@ static ssize_t amdgpu_get_pp_dpm_sclk(struct device *dev,
static ssize_t amdgpu_read_mask(const char *buf, size_t count, uint32_t *mask)
{
int ret;
- long level;
+ unsigned long level;
char *sub_str = NULL;
char *tmp;
char buf_cpy[AMDGPU_MASK_BUF_MAX + 1];
@@ -1109,9 +1109,9 @@ static ssize_t amdgpu_read_mask(const char *buf, size_t count, uint32_t *mask)
tmp = buf_cpy;
while (tmp[0]) {
sub_str = strsep(&tmp, delimiter);
- if (strlen(sub_str)) {
- ret = kstrtol(sub_str, 0, &level);
- if (ret)
+ if (sub_str[0]) {
+ ret = kstrtoul(sub_str, 0, &level);
+ if (ret || level > 31)
return -EINVAL;
*mask |= 1 << level;
} else
--
2.29.2
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