From: Ivan Stepchenko Date: Mon, 2 Dec 2024 08:00:43 +0000 (+0300) Subject: drm/amdgpu: Fix potential NULL pointer dereference in atomctrl_get_smc_sclk_range_table X-Git-Tag: v6.14-rc1~174^2~14^2~141 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=357445e28ff004d7f10967aa93ddb4bffa5c3688;p=thirdparty%2Fkernel%2Flinux.git drm/amdgpu: Fix potential NULL pointer dereference in atomctrl_get_smc_sclk_range_table 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 Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c index fe24219c3bf48..4bd92fd782be6 100644 --- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c +++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/ppatomctrl.c @@ -992,6 +992,8 @@ 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;