6.6-stable review patch. If anyone has any objections, please let me know.
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From: Ivan Stepchenko sid@itb.spb.ru
[ Upstream commit 357445e28ff004d7f10967aa93ddb4bffa5c3688 ]
The function atomctrl_get_smc_sclk_range_table() does not check the return value of smu_atom_get_data_table(). If smu_atom_get_data_table() fails to retrieve SMU_Info table, it returns NULL which is later dereferenced.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
In practice this should never happen as this code only gets called on polaris chips and the vbios data table will always be present on those chips.
Fixes: a23eefa2f461 ("drm/amd/powerplay: enable dpm for baffin.") Signed-off-by: Ivan Stepchenko sid@itb.spb.ru Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c index cc3b62f733941..1fbd23922082a 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c @@ -1420,6 +1420,8 @@ int atomctrl_get_smc_sclk_range_table(struct pp_hwmgr *hwmgr, struct pp_atom_ctr GetIndexIntoMasterTable(DATA, SMU_Info), &size, &frev, &crev);
+ if (!psmu_info) + return -EINVAL;
for (i = 0; i < psmu_info->ucSclkEntryNum; i++) { table->entry[i].ucVco_setting = psmu_info->asSclkFcwRangeEntry[i].ucVco_setting;