drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1229 mes_v12_1_kiq_enable_queue() error: buffer overflow 'adev->mes.ring' 16 <= s32max

BCC: [email protected]
CC: [email protected]
CC: [email protected]
TO: Jack Xiao <[email protected]>
CC: Alex Deucher <[email protected]>
CC: Hawking Zhang <[email protected]>
CC: Mukul Joshi <[email protected]>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   bcc44b6785f216eb939226ade6e3910baa30516b
commit: e220edf2d6fd6dbf08fa93790809500a80217948 drm/amdgpu/mes_v12_1: initial support for mes_v12_1
date:   8 months ago
:::::: branch date: 13 hours ago
:::::: commit date: 8 months ago
config: i386-randconfig-141-20260806 (https://download.01.org/0day-ci/archive/20260808/[email protected]/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
smatch: v0.5.0-9187-g5189e3fb

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Fixes: e220edf2d6fd ("drm/amdgpu/mes_v12_1: initial support for mes_v12_1")
| Reported-by: kernel test robot <[email protected]>
| Reported-by: Dan Carpenter <[email protected]>
| Closes: https://lore.kernel.org/r/[email protected]/

New smatch warnings:
drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1229 mes_v12_1_kiq_enable_queue() error: buffer overflow 'adev->mes.ring' 16 <= s32max
drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1516 mes_v12_1_kiq_dequeue_sched() error: buffer overflow 'adev->mes.ring' 16 <= s32max
drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1604 mes_v12_1_kiq_hw_fini() error: buffer overflow 'adev->mes.ring' 16 <= s32max
drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1625 mes_v12_1_xcc_hw_init() error: buffer overflow 'adev->mes.ring' 16 <= s32max

Old smatch warnings:
drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1607 mes_v12_1_kiq_hw_fini() error: buffer overflow 'adev->mes.ring' 16 <= s32max
drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1612 mes_v12_1_kiq_hw_fini() error: buffer overflow 'adev->mes.ring' 16 <= s32max
drivers/gpu/drm/amd/amdgpu/mes_v12_1.c:1680 mes_v12_1_xcc_hw_init() error: buffer overflow 'adev->mes.ring' 16 <= s32max

vim +1229 drivers/gpu/drm/amd/amdgpu/mes_v12_1.c

e220edf2d6fd6d Jack Xiao 2025-05-14  1213  
e220edf2d6fd6d Jack Xiao 2025-05-14  1214  static int mes_v12_1_kiq_enable_queue(struct amdgpu_device *adev, int xcc_id)
e220edf2d6fd6d Jack Xiao 2025-05-14  1215  {
e220edf2d6fd6d Jack Xiao 2025-05-14  1216  	struct amdgpu_kiq *kiq = &adev->gfx.kiq[xcc_id];
e220edf2d6fd6d Jack Xiao 2025-05-14  1217  	struct amdgpu_ring *kiq_ring = &adev->gfx.kiq[xcc_id].ring;
e220edf2d6fd6d Jack Xiao 2025-05-14  1218  	int r, inst = MES_PIPE_INST(xcc_id, AMDGPU_MES_SCHED_PIPE);
e220edf2d6fd6d Jack Xiao 2025-05-14  1219  
e220edf2d6fd6d Jack Xiao 2025-05-14  1220  	if (!kiq->pmf || !kiq->pmf->kiq_map_queues)
e220edf2d6fd6d Jack Xiao 2025-05-14  1221  		return -EINVAL;
e220edf2d6fd6d Jack Xiao 2025-05-14  1222  
e220edf2d6fd6d Jack Xiao 2025-05-14  1223  	r = amdgpu_ring_alloc(kiq_ring, kiq->pmf->map_queues_size);
e220edf2d6fd6d Jack Xiao 2025-05-14  1224  	if (r) {
e220edf2d6fd6d Jack Xiao 2025-05-14  1225  		DRM_ERROR("Failed to lock KIQ (%d).\n", r);
e220edf2d6fd6d Jack Xiao 2025-05-14  1226  		return r;
e220edf2d6fd6d Jack Xiao 2025-05-14  1227  	}
e220edf2d6fd6d Jack Xiao 2025-05-14  1228  
e220edf2d6fd6d Jack Xiao 2025-05-14 @1229  	kiq->pmf->kiq_map_queues(kiq_ring, &adev->mes.ring[inst]);
e220edf2d6fd6d Jack Xiao 2025-05-14  1230  
e220edf2d6fd6d Jack Xiao 2025-05-14  1231  	r = amdgpu_ring_test_ring(kiq_ring);
e220edf2d6fd6d Jack Xiao 2025-05-14  1232  	if (r) {
e220edf2d6fd6d Jack Xiao 2025-05-14  1233  		DRM_ERROR("kfq enable failed\n");
e220edf2d6fd6d Jack Xiao 2025-05-14  1234  		kiq_ring->sched.ready = false;
e220edf2d6fd6d Jack Xiao 2025-05-14  1235  	}
e220edf2d6fd6d Jack Xiao 2025-05-14  1236  	return r;
e220edf2d6fd6d Jack Xiao 2025-05-14  1237  }
e220edf2d6fd6d Jack Xiao 2025-05-14  1238  

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