Re: [PATCH 5/5] vdpasim: vDPA device simulator

[Jason Wang]

On 2020/1/28 äå11:32, Dan Carpenter wrote:
> Hi Jason,
>
> url:    https://github.com/0day-ci/linux/commits/Jason-Wang/vDPA-support/20200117-170243
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next


Will fix this.

Thanks


> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@xxxxxxxxx>
> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>
> smatch warnings:
> drivers/virtio/vdpa/vdpa_sim.c:288 vdpasim_alloc_coherent() warn: returning freed memory 'addr'
>
> # https://github.com/0day-ci/linux/commit/55047769b3e974d68b2aab5ce0022459b172a23f
> git remote add linux-review https://github.com/0day-ci/linux
> git remote update linux-review
> git checkout 55047769b3e974d68b2aab5ce0022459b172a23f
> vim +/addr +288 drivers/virtio/vdpa/vdpa_sim.c
>
> 55047769b3e974 Jason Wang 2020-01-16  263  static void *vdpasim_alloc_coherent(struct device *dev, size_t size,
> 55047769b3e974 Jason Wang 2020-01-16  264  				    dma_addr_t *dma_addr, gfp_t flag,
> 55047769b3e974 Jason Wang 2020-01-16  265  				    unsigned long attrs)
> 55047769b3e974 Jason Wang 2020-01-16  266  {
> 55047769b3e974 Jason Wang 2020-01-16  267  	struct vdpa_device *vdpa = dev_to_vdpa(dev);
> 55047769b3e974 Jason Wang 2020-01-16  268  	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
> 55047769b3e974 Jason Wang 2020-01-16  269  	struct vhost_iotlb *iommu = vdpasim->iommu;
> 55047769b3e974 Jason Wang 2020-01-16  270  	void *addr = kmalloc(size, flag);
> 55047769b3e974 Jason Wang 2020-01-16  271  	int ret;
> 55047769b3e974 Jason Wang 2020-01-16  272
> 55047769b3e974 Jason Wang 2020-01-16  273  	if (!addr)
> 55047769b3e974 Jason Wang 2020-01-16  274  		*dma_addr = DMA_MAPPING_ERROR;
> 55047769b3e974 Jason Wang 2020-01-16  275  	else {
> 55047769b3e974 Jason Wang 2020-01-16  276  		u64 pa = virt_to_phys(addr);
> 55047769b3e974 Jason Wang 2020-01-16  277
> 55047769b3e974 Jason Wang 2020-01-16  278  		ret = vhost_iotlb_add_range(iommu, (u64)pa,
> 55047769b3e974 Jason Wang 2020-01-16  279  					    (u64)pa + size - 1,
> 55047769b3e974 Jason Wang 2020-01-16  280  					    pa, VHOST_MAP_RW);
> 55047769b3e974 Jason Wang 2020-01-16  281  		if (ret) {
> 55047769b3e974 Jason Wang 2020-01-16  282  			kfree(addr);
>                                                                  ^^^^^^^^^^^
> 55047769b3e974 Jason Wang 2020-01-16  283  			*dma_addr = DMA_MAPPING_ERROR;
> 55047769b3e974 Jason Wang 2020-01-16  284  		} else
> 55047769b3e974 Jason Wang 2020-01-16  285  			*dma_addr = (dma_addr_t)pa;
> 55047769b3e974 Jason Wang 2020-01-16  286  	}
> 55047769b3e974 Jason Wang 2020-01-16  287
> 55047769b3e974 Jason Wang 2020-01-16 @288  	return addr;
>                                                  ^^^^^^^^^^^^
> 55047769b3e974 Jason Wang 2020-01-16  289  }
>
> ---
> 0-DAY kernel test infrastructure                 Open Source Technology Center
> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx Intel Corporation