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drm/amdgpu: Prevent shift wrapping in amdgpu_read_mask()

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[ Upstream commit c915ef890d5dc79f483e1ca3b3a5b5f1a170690c ]

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@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2021-02-02 08:56:36 +03:00 committed by Greg Kroah-Hartman
parent c1a421b198
commit 721c986986
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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@ -870,7 +870,7 @@ 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];
@ -886,8 +886,8 @@ static ssize_t amdgpu_read_mask(const char *buf, size_t count, uint32_t *mask)
while (tmp[0]) {
sub_str = strsep(&tmp, delimiter);
if (strlen(sub_str)) {
ret = kstrtol(sub_str, 0, &level);
if (ret)
ret = kstrtoul(sub_str, 0, &level);
if (ret || level > 31)
return -EINVAL;
*mask |= 1 << level;
} else