Hello Maarten Lankhorst,
This is a semi-automatic email about new static checker warnings.
The patch 0108bc808107: "drm/nouveau: do not allow negative sizes for
now" from Jul 7, 2013, leads to the following Smatch complaint:
drivers/gpu/drm/nouveau/nouveau_bo.c:222 nouveau_bo_new()
warn: variable dereferenced before check 'drm->client.base.vm' (see
line 201)
drivers/gpu/drm/nouveau/nouveau_bo.c
200 int type = ttm_bo_type_device;
201 int max_size = INT_MAX & ~((1 <<
drm->client.base.vm->vmm->lpg_shift) - 1);
^^^^^^^^^^^^^^^^^^^
New dereference.
202
203 if (size <= 0 || size > max_size) {
204 nv_warn(drm, "skipped size %x\n", (u32)size);
205 return -EINVAL;
206 }
207
208 if (sg)
209 type = ttm_bo_type_sg;
210
211 nvbo = kzalloc(sizeof(struct nouveau_bo), GFP_KERNEL);
212 if (!nvbo)
213 return -ENOMEM;
214 INIT_LIST_HEAD(&nvbo->head);
215 INIT_LIST_HEAD(&nvbo->entry);
216 INIT_LIST_HEAD(&nvbo->vma_list);
217 nvbo->tile_mode = tile_mode;
218 nvbo->tile_flags = tile_flags;
219 nvbo->bo.bdev = &drm->ttm.bdev;
220
221 nvbo->page_shift = 12;
222 if (drm->client.base.vm) {
^^^^^^^^^^^^^^^^^^^
Old check.
223 if (!(flags & TTM_PL_FLAG_TT) && size > 256 * 1024)
224 nvbo->page_shift =
drm->client.base.vm->vmm->lpg_shift;
regards,
dan carpenter
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