From 6f5ecf771806434b9d82a6918e7db1afa8f4ea62 Mon Sep 17 00:00:00 2001 From: Ivan Stepchenko Date: Mon, 2 Dec 2024 11:00:43 +0300 Subject: [PATCH] drm/amdgpu: Fix potential NULL pointer dereference in atomctrl_get_smc_sclk_range_table BugLink: https://bugs.launchpad.net/bugs/2111953 [ 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 Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin CVE-2024-58052 Signed-off-by: Manuel Diewald Signed-off-by: Mehmet Basaran --- 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 b56298d9da98..5c54c9fd4461 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;