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Date: Fri, 27 May 2022 07:56:48 +0000
From: "Chen, Guchun" <Guchun.Chen@....com>
To: Dan Carpenter <dan.carpenter@...cle.com>,
"kbuild@...ts.01.org" <kbuild@...ts.01.org>,
"Deucher, Alexander" <Alexander.Deucher@....com>
CC: "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>,
"lkp@...el.com" <lkp@...el.com>,
"amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [kbuild] drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:1433
amdgpu_discovery_get_vcn_info() error: buffer overflow
'adev->vcn.vcn_codec_disable_mask' 2 <= 3
A patch was available already to protect against such scenario.
https://patchwork.freedesktop.org/patch/486289/, "drm/amdgpu/discovery: validate VCN and SDMA instances"
Regards,
Guchun
-----Original Message-----
From: amd-gfx <amd-gfx-bounces@...ts.freedesktop.org> On Behalf Of Dan Carpenter
Sent: Friday, May 27, 2022 3:46 PM
To: kbuild@...ts.01.org; Deucher, Alexander <Alexander.Deucher@....com>
Cc: kbuild-all@...ts.01.org; lkp@...el.com; amd-gfx@...ts.freedesktop.org; linux-kernel@...r.kernel.org
Subject: [kbuild] drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:1433 amdgpu_discovery_get_vcn_info() error: buffer overflow 'adev->vcn.vcn_codec_disable_mask' 2 <= 3
[ kbuild bot sent this warning on May 4 but I never heard back and it's
May 27 now so sending a duplicate warning is probably for the best. -dan]
tree: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git&data=05%7C01%7Cguchun.chen%40amd.com%7Cfc2110078e5c4790337808da3fb50de6%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637892344114571722%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=4AYyKswjTmjKoNdRpOxWPW2R2o2RU5CkrYRuelaCafA%3D&reserved=0 master
head: 7e284070abe53d448517b80493863595af4ab5f0
commit: 622469c87fc3e6c90a980be3e2287d82bd55c977 drm/amdgpu/discovery: add a function to parse the vcn info table
config: arc-randconfig-m031-20220524 (https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20220527%2F202205271546.oV14N2r8-lkp%40intel.com%2Fconfig&data=05%7C01%7Cguchun.chen%40amd.com%7Cfc2110078e5c4790337808da3fb50de6%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637892344114571722%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=osyRhU3i%2Fdnwcu%2Fz9T0278PTeEFuM%2BAWw8zR43ir%2FhQ%3D&reserved=0 )
compiler: arceb-elf-gcc (GCC) 11.3.0
If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
smatch warnings:
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:1433 amdgpu_discovery_get_vcn_info() error: buffer overflow 'adev->vcn.vcn_codec_disable_mask' 2 <= 3
vim +1433 drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
622469c87fc3e6 Alex Deucher 2022-03-30 1403 int amdgpu_discovery_get_vcn_info(struct amdgpu_device *adev)
622469c87fc3e6 Alex Deucher 2022-03-30 1404 {
622469c87fc3e6 Alex Deucher 2022-03-30 1405 struct binary_header *bhdr;
622469c87fc3e6 Alex Deucher 2022-03-30 1406 union vcn_info *vcn_info;
622469c87fc3e6 Alex Deucher 2022-03-30 1407 u16 offset;
622469c87fc3e6 Alex Deucher 2022-03-30 1408 int v;
622469c87fc3e6 Alex Deucher 2022-03-30 1409
622469c87fc3e6 Alex Deucher 2022-03-30 1410 if (!adev->mman.discovery_bin) {
622469c87fc3e6 Alex Deucher 2022-03-30 1411 DRM_ERROR("ip discovery uninitialized\n");
622469c87fc3e6 Alex Deucher 2022-03-30 1412 return -EINVAL;
622469c87fc3e6 Alex Deucher 2022-03-30 1413 }
622469c87fc3e6 Alex Deucher 2022-03-30 1414
622469c87fc3e6 Alex Deucher 2022-03-30 1415 if (adev->vcn.num_vcn_inst > VCN_INFO_TABLE_MAX_NUM_INSTANCES) {
Capped to 4
622469c87fc3e6 Alex Deucher 2022-03-30 1416 dev_err(adev->dev, "invalid vcn instances\n");
622469c87fc3e6 Alex Deucher 2022-03-30 1417 return -EINVAL;
622469c87fc3e6 Alex Deucher 2022-03-30 1418 }
622469c87fc3e6 Alex Deucher 2022-03-30 1419
622469c87fc3e6 Alex Deucher 2022-03-30 1420 bhdr = (struct binary_header *)adev->mman.discovery_bin;
622469c87fc3e6 Alex Deucher 2022-03-30 1421 offset = le16_to_cpu(bhdr->table_list[VCN_INFO].offset);
622469c87fc3e6 Alex Deucher 2022-03-30 1422
622469c87fc3e6 Alex Deucher 2022-03-30 1423 if (!offset) {
622469c87fc3e6 Alex Deucher 2022-03-30 1424 dev_err(adev->dev, "invalid vcn table offset\n");
622469c87fc3e6 Alex Deucher 2022-03-30 1425 return -EINVAL;
622469c87fc3e6 Alex Deucher 2022-03-30 1426 }
622469c87fc3e6 Alex Deucher 2022-03-30 1427
622469c87fc3e6 Alex Deucher 2022-03-30 1428 vcn_info = (union vcn_info *)(adev->mman.discovery_bin + offset);
622469c87fc3e6 Alex Deucher 2022-03-30 1429
622469c87fc3e6 Alex Deucher 2022-03-30 1430 switch (le16_to_cpu(vcn_info->v1.header.version_major)) {
622469c87fc3e6 Alex Deucher 2022-03-30 1431 case 1:
622469c87fc3e6 Alex Deucher 2022-03-30 1432 for (v = 0; v < adev->vcn.num_vcn_inst; v++) {
622469c87fc3e6 Alex Deucher 2022-03-30 @1433 adev->vcn.vcn_codec_disable_mask[v] =
But this array doesn't have 4 elements
622469c87fc3e6 Alex Deucher 2022-03-30 1434 le32_to_cpu(vcn_info->v1.instance_info[v].fuse_data.all_bits);
622469c87fc3e6 Alex Deucher 2022-03-30 1435 }
622469c87fc3e6 Alex Deucher 2022-03-30 1436 break;
622469c87fc3e6 Alex Deucher 2022-03-30 1437 default:
622469c87fc3e6 Alex Deucher 2022-03-30 1438 dev_err(adev->dev,
622469c87fc3e6 Alex Deucher 2022-03-30 1439 "Unhandled VCN info table %d.%d\n",
622469c87fc3e6 Alex Deucher 2022-03-30 1440 le16_to_cpu(vcn_info->v1.header.version_major),
622469c87fc3e6 Alex Deucher 2022-03-30 1441 le16_to_cpu(vcn_info->v1.header.version_minor));
622469c87fc3e6 Alex Deucher 2022-03-30 1442 return -EINVAL;
622469c87fc3e6 Alex Deucher 2022-03-30 1443 }
622469c87fc3e6 Alex Deucher 2022-03-30 1444 return 0;
f39f5bb1c9d68d Xiaojie Yuan 2019-06-20 1445 }
--
0-DAY CI Kernel Test Service
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2F01.org%2Flkp&data=05%7C01%7Cguchun.chen%40amd.com%7Cfc2110078e5c4790337808da3fb50de6%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637892344114571722%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=FEZiW7nVnlbPvQRbf2TUEbh15BsdY0tRLKvWFtPknuA%3D&reserved=0
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