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drm/amdgpu: add upper bound check on user inputs in signal ioctl

Huge input values in amdgpu_userq_signal_ioctl can lead to a OOM and
could be exploited.

So check these input value against AMDGPU_USERQ_MAX_HANDLES
which is big enough value for genuine use cases and could
potentially avoid OOM.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

authored by

Sunil Khatri and committed by
Alex Deucher be267e15 2de9353e

+7
+7
drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
··· 35 35 static const struct dma_fence_ops amdgpu_userq_fence_ops; 36 36 static struct kmem_cache *amdgpu_userq_fence_slab; 37 37 38 + #define AMDGPU_USERQ_MAX_HANDLES (1U << 16) 39 + 38 40 int amdgpu_userq_fence_slab_init(void) 39 41 { 40 42 amdgpu_userq_fence_slab = kmem_cache_create("amdgpu_userq_fence", ··· 478 476 479 477 if (!amdgpu_userq_enabled(dev)) 480 478 return -ENOTSUPP; 479 + 480 + if (args->num_syncobj_handles > AMDGPU_USERQ_MAX_HANDLES || 481 + args->num_bo_write_handles > AMDGPU_USERQ_MAX_HANDLES || 482 + args->num_bo_read_handles > AMDGPU_USERQ_MAX_HANDLES) 483 + return -EINVAL; 481 484 482 485 num_syncobj_handles = args->num_syncobj_handles; 483 486 syncobj_handles = memdup_array_user(u64_to_user_ptr(args->syncobj_handles),