diff options
| author | Kees Cook <keescook@chromium.org> | 2021-05-03 07:06:08 +0200 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-05-04 23:37:57 +0200 |
| commit | c69f27137a38d24301a6b659454a91ad85dff4aa (patch) | |
| tree | e0ed63039090e16766eadd6b3b218d6413f11328 /drivers | |
| parent | drm/radeon: Fix off-by-one power_state index heap overwrite (diff) | |
| download | linux-c69f27137a38d24301a6b659454a91ad85dff4aa.tar.xz linux-c69f27137a38d24301a6b659454a91ad85dff4aa.zip | |
drm/radeon: Avoid power table parsing memory leaks
Avoid leaving a hanging pre-allocated clock_info if last mode is
invalid, and avoid heap corruption if no valid modes are found.
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=211537
Fixes: 6991b8f2a319 ("drm/radeon/kms: fix segfault in pm rework")
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_atombios.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c index f9f4efa1738c..28c4413f4dc8 100644 --- a/drivers/gpu/drm/radeon/radeon_atombios.c +++ b/drivers/gpu/drm/radeon/radeon_atombios.c @@ -2120,11 +2120,14 @@ static int radeon_atombios_parse_power_table_1_3(struct radeon_device *rdev) return state_index; /* last mode is usually default, array is low to high */ for (i = 0; i < num_modes; i++) { - rdev->pm.power_state[state_index].clock_info = - kcalloc(1, sizeof(struct radeon_pm_clock_info), - GFP_KERNEL); + /* avoid memory leaks from invalid modes or unknown frev. */ + if (!rdev->pm.power_state[state_index].clock_info) { + rdev->pm.power_state[state_index].clock_info = + kzalloc(sizeof(struct radeon_pm_clock_info), + GFP_KERNEL); + } if (!rdev->pm.power_state[state_index].clock_info) - return state_index; + goto out; rdev->pm.power_state[state_index].num_clock_modes = 1; rdev->pm.power_state[state_index].clock_info[0].voltage.type = VOLTAGE_NONE; switch (frev) { @@ -2243,8 +2246,15 @@ static int radeon_atombios_parse_power_table_1_3(struct radeon_device *rdev) break; } } +out: + /* free any unused clock_info allocation. */ + if (state_index && state_index < num_modes) { + kfree(rdev->pm.power_state[state_index].clock_info); + rdev->pm.power_state[state_index].clock_info = NULL; + } + /* last mode is usually default */ - if (rdev->pm.default_power_state_index == -1) { + if (state_index && rdev->pm.default_power_state_index == -1) { rdev->pm.power_state[state_index - 1].type = POWER_STATE_TYPE_DEFAULT; rdev->pm.default_power_state_index = state_index - 1; |