drm/amdgpu: prevent memory leaks in AMDGPU_CS ioctl

Error out if the AMDGPU_CS ioctl is called with multiple SYNCOBJ_OUT and/or
TIMELINE_SIGNAL chunks, since otherwise the last chunk wins while the
allocated array as well as the reference counts of sync objects are leaked.

Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 9ccf32c..2fcdc60 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1143,6 +1143,9 @@ static int amdgpu_cs_process_syncobj_out_dep(struct amdgpu_cs_parser *p,
        num_deps = chunk->length_dw * 4 /
                sizeof(struct drm_amdgpu_cs_chunk_sem);
 
+       if (p->post_deps)
+               return -EINVAL;
+
        p->post_deps = kmalloc_array(num_deps, sizeof(*p->post_deps),
                                     GFP_KERNEL);
        p->num_post_deps = 0;
@@ -1166,8 +1169,7 @@ static int amdgpu_cs_process_syncobj_out_dep(struct amdgpu_cs_parser *p,
 
 
 static int amdgpu_cs_process_syncobj_timeline_out_dep(struct amdgpu_cs_parser *p,
-                                                     struct amdgpu_cs_chunk
-                                                     *chunk)
+                                                     struct amdgpu_cs_chunk *chunk)
 {
        struct drm_amdgpu_cs_chunk_syncobj *syncobj_deps;
        unsigned num_deps;
@@ -1177,6 +1179,9 @@ static int amdgpu_cs_process_syncobj_timeline_out_dep(struct amdgpu_cs_parser *p
        num_deps = chunk->length_dw * 4 /
                sizeof(struct drm_amdgpu_cs_chunk_syncobj);
 
+       if (p->post_deps)
+               return -EINVAL;
+
        p->post_deps = kmalloc_array(num_deps, sizeof(*p->post_deps),
                                     GFP_KERNEL);
        p->num_post_deps = 0;