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drm/amdgpu: unwind properly in amdgpu_cs_parser_init()

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The amdgpu_cs_parser_init() function doesn't clean up after itself but
instead the caller uses a free everything function amdgpu_cs_parser_fini()
on failure.  This style of error handling is often buggy.  In this
example, we call "drm_free_large(parser->chunks[i].kdata);" when it is
an unintialized pointer or when "parser->chunks" is NULL.

I fixed this bug by adding unwind code so that it frees everything that
it allocates.

I also mode some other very minor changes:
1) Renamed "r" to "ret".
2) Moved the chunk_array allocation to the start of the function.
3) Removed some initializers which are no longer needed.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dan Carpenter 2015-09-23 13:59:28 +03:00 committed by Alex Deucher
parent 5a6adfa20b
commit 1d263474c4
1 changed files with 51 additions and 34 deletions
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85
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
View File

@ -154,42 +154,41 @@ int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p, void *data)
{
union drm_amdgpu_cs *cs = data;
uint64_t *chunk_array_user;
uint64_t *chunk_array = NULL;
uint64_t *chunk_array;
struct amdgpu_fpriv *fpriv = p->filp->driver_priv;
unsigned size, i;
int r = 0;
int ret;
if (!cs->in.num_chunks)
goto out;
if (cs->in.num_chunks == 0)
return 0;
chunk_array = kmalloc_array(cs->in.num_chunks, sizeof(uint64_t), GFP_KERNEL);
if (!chunk_array)
return -ENOMEM;
p->ctx = amdgpu_ctx_get(fpriv, cs->in.ctx_id);
if (!p->ctx) {
r = -EINVAL;
goto out;
ret = -EINVAL;
goto free_chunk;
}
p->bo_list = amdgpu_bo_list_get(fpriv, cs->in.bo_list_handle);
/* get chunks */
INIT_LIST_HEAD(&p->validated);
chunk_array = kmalloc_array(cs->in.num_chunks, sizeof(uint64_t), GFP_KERNEL);
if (chunk_array == NULL) {
r = -ENOMEM;
goto out;
}
chunk_array_user = (uint64_t __user *)(cs->in.chunks);
if (copy_from_user(chunk_array, chunk_array_user,
sizeof(uint64_t)*cs->in.num_chunks)) {
r = -EFAULT;
goto out;
ret = -EFAULT;
goto put_bo_list;
}
p->nchunks = cs->in.num_chunks;
p->chunks = kmalloc_array(p->nchunks, sizeof(struct amdgpu_cs_chunk),
GFP_KERNEL);
if (p->chunks == NULL) {
r = -ENOMEM;
goto out;
if (!p->chunks) {
ret = -ENOMEM;
goto put_bo_list;
}
for (i = 0; i < p->nchunks; i++) {
@ -200,8 +199,9 @@ int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p, void *data)
chunk_ptr = (void __user *)chunk_array[i];
if (copy_from_user(&user_chunk, chunk_ptr,
sizeof(struct drm_amdgpu_cs_chunk))) {
r = -EFAULT;
goto out;
ret = -EFAULT;
i--;
goto free_partial_kdata;
}
p->chunks[i].chunk_id = user_chunk.chunk_id;
p->chunks[i].length_dw = user_chunk.length_dw;
@ -212,13 +212,14 @@ int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p, void *data)
p->chunks[i].kdata = drm_malloc_ab(size, sizeof(uint32_t));
if (p->chunks[i].kdata == NULL) {
r = -ENOMEM;
goto out;
ret = -ENOMEM;
i--;
goto free_partial_kdata;
}
size *= sizeof(uint32_t);
if (copy_from_user(p->chunks[i].kdata, cdata, size)) {
r = -EFAULT;
goto out;
ret = -EFAULT;
goto free_partial_kdata;
}
switch (p->chunks[i].chunk_id) {
@ -238,15 +239,15 @@ int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p, void *data)
gobj = drm_gem_object_lookup(p->adev->ddev,
p->filp, handle);
if (gobj == NULL) {
r = -EINVAL;
goto out;
ret = -EINVAL;
goto free_partial_kdata;
}
p->uf.bo = gem_to_amdgpu_bo(gobj);
p->uf.offset = fence_data->offset;
} else {
r = -EINVAL;
goto out;
ret = -EINVAL;
goto free_partial_kdata;
}
break;
@ -254,19 +255,35 @@ int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p, void *data)
break;
default:
r = -EINVAL;
goto out;
ret = -EINVAL;
goto free_partial_kdata;
}
}
p->ibs = kcalloc(p->num_ibs, sizeof(struct amdgpu_ib), GFP_KERNEL);
if (!p->ibs)
r = -ENOMEM;
if (!p->ibs) {
ret = -ENOMEM;
goto free_all_kdata;
}
out:
kfree(chunk_array);
return r;
return 0;
free_all_kdata:
i = p->nchunks - 1;
free_partial_kdata:
for (; i >= 0; i--)
drm_free_large(p->chunks[i].kdata);
kfree(p->chunks);
put_bo_list:
if (p->bo_list)
amdgpu_bo_list_put(p->bo_list);
amdgpu_ctx_put(p->ctx);
free_chunk:
kfree(chunk_array);
return ret;
}
/* Returns how many bytes TTM can move per IB.
@ -810,7 +827,7 @@ int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
r = amdgpu_cs_parser_init(parser, data);
if (r) {
DRM_ERROR("Failed to initialize parser !\n");
amdgpu_cs_parser_fini(parser, r, false);
kfree(parser);
up_read(&adev->exclusive_lock);
r = amdgpu_cs_handle_lockup(adev, r);
return r;