radeon: use kvcalloc for relocs and chunks

kvmalloc_array + __GFP_ZERO is the same with kvcalloc.

As for p->chunks, it will be used in:
```
if (ib_chunk->kdata)
		memcpy(parser->ib.ptr, ib_chunk->kdata, ib_chunk->length_dw * 4);
```

If chunks doesn't zero out with __GFP_ZERO, it may point to somewhere else, e.g.,
```
Unable to handle kernel paging request at virtual address 0000000000010000
...
pc is at memcpy+0x84/0x250
ra is at radeon_cs_ioctl+0x368/0xb90 [radeon]
```

after allocating chunks with __GFP_KERNEL/kvcalloc, this bug is fixed.
Fixes: 3fcb4f01deed ("drm/radeon: Use kvmalloc for CS chunks")
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Chen Li <chenli@uniontech.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/radeon_cs.c b/drivers/gpu/drm/radeon/radeon_cs.c
index fb736ef9f9aa8b3483e9f8df5d1d05bbe6706031..059431689c2db28ed996cd5a50f690f7cb372614 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_cs.c
+++ b/drivers/gpu/drm/radeon/radeon_cs.c
@@ -93,8 +93,8 @@ static int radeon_cs_parser_relocs(struct radeon_cs_parser *p)
        p->dma_reloc_idx = 0;
        /* FIXME: we assume that each relocs use 4 dwords */
        p->nrelocs = chunk->length_dw / 4;
-       p->relocs = kvmalloc_array(p->nrelocs, sizeof(struct radeon_bo_list),
-                       GFP_KERNEL | __GFP_ZERO);
+       p->relocs = kvcalloc(p->nrelocs, sizeof(struct radeon_bo_list),
+                       GFP_KERNEL);
        if (p->relocs == NULL) {
                return -ENOMEM;
        }
@@ -299,7 +299,7 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
        }
        p->cs_flags = 0;
        p->nchunks = cs->num_chunks;
-       p->chunks = kvmalloc_array(p->nchunks, sizeof(struct radeon_cs_chunk), GFP_KERNEL);
+       p->chunks = kvcalloc(p->nchunks, sizeof(struct radeon_cs_chunk), GFP_KERNEL);
        if (p->chunks == NULL) {
                return -ENOMEM;
        }