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| author | Gautam Dawar <gautam.dawar@amd.com> | 2023-03-01 19:32:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-22 15:33:44 +0300 |
| commit | 374bcab6c14153db7956a989709942776902b850 (patch) | |
| tree | 323a171a9763d8228c4d3efc90d0664470401aca | |
| parent | c703362a66ea971905b9dc153fc54d1b6ac05423 (diff) | |
| download | linux-374bcab6c14153db7956a989709942776902b850.tar.xz | |
vhost-vdpa: free iommu domain after last use during cleanup
[ Upstream commit 5a522150093a0eabae9470a70a37a6e436bfad08 ]
Currently vhost_vdpa_cleanup() unmaps the DMA mappings by calling
`iommu_unmap(v->domain, map->start, map->size);`
from vhost_vdpa_general_unmap() when the parent vDPA driver doesn't
provide DMA config operations.
However, the IOMMU domain referred to by `v->domain` is freed in
vhost_vdpa_free_domain() before vhost_vdpa_cleanup() in
vhost_vdpa_release() which results in NULL pointer de-reference.
Accordingly, moving the call to vhost_vdpa_free_domain() in
vhost_vdpa_cleanup() would makes sense. This will also help
detaching the dma device in error handling of vhost_vdpa_alloc_domain().
This issue was observed on terminating QEMU with SIGQUIT.
Fixes: 037d4305569a ("vhost-vdpa: call vhost_vdpa_cleanup during the release")
Signed-off-by: Gautam Dawar <gautam.dawar@amd.com>
Message-Id: <20230301163203.29883-1-gautam.dawar@amd.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/vhost/vdpa.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index ec32f785dfde..b7657984dd8d 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -1134,6 +1134,7 @@ static int vhost_vdpa_alloc_domain(struct vhost_vdpa *v) err_attach: iommu_domain_free(v->domain); + v->domain = NULL; return ret; } @@ -1178,6 +1179,7 @@ static void vhost_vdpa_cleanup(struct vhost_vdpa *v) vhost_vdpa_remove_as(v, asid); } + vhost_vdpa_free_domain(v); vhost_dev_cleanup(&v->vdev); kfree(v->vdev.vqs); } @@ -1250,7 +1252,6 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep) vhost_vdpa_clean_irq(v); vhost_vdpa_reset(v); vhost_dev_stop(&v->vdev); - vhost_vdpa_free_domain(v); vhost_vdpa_config_put(v); vhost_vdpa_cleanup(v); mutex_unlock(&d->mutex); |