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nvmap: Don't free pages while freeing subhandle

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This patch fixes the following issues:
- When the handle associated with the sub-buffer is freed, the call to
the nvmap_page_pool_fill_lots is made, which would free the pages when
the refcount on the pages is > 1, even though the main handle is not
freed, hence add a check for sub-handle.
- In cpu unmap code, list_for_each_entry is used for iterating over the
vma list and in the same loop list_del is aldo being called, this can
lead to undefined behavior, instead use list_for_each_entry_safe which
is safe against removal of list entry.
- Mutex of sub-handle is not initialized, fix it by initializing it.
- Set error value when handle creation failed.

Bug 3494980

Change-Id: I0659d7f70b44814e87e3081702352e891d9191f7
Signed-off-by: Ketan Patil <ketanp@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2824668
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Puneet Saxena <puneets@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Ketan Patil
2022-12-09 03:50:33 +00:00
committed by Laxman Dewangan
parent abb244025f
commit 85f7def3a6
3 changed files with 7 additions and 4 deletions
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2
drivers/video/tegra/nvmap/nvmap_alloc.c
View File

@@ -1037,7 +1037,7 @@ void _nvmap_handle_free(struct nvmap_handle *h)
h->pgalloc.pages[i] = nvmap_to_page(h->pgalloc.pages[i]);
#ifdef NVMAP_CONFIG_PAGE_POOLS
if (!h->from_va)
if (!h->from_va && !h->is_subhandle)
page_index = nvmap_page_pool_fill_lots(&nvmap_dev->pool,
h->pgalloc.pages, nr_page);
#endif

4
drivers/video/tegra/nvmap/nvmap_fault.c
View File

@@ -130,7 +130,7 @@ unlock:
static void nvmap_vma_close(struct vm_area_struct *vma)
{
struct nvmap_vma_priv *priv = vma->vm_private_data;
struct nvmap_vma_list *vma_list;
struct nvmap_vma_list *vma_list, *tmp_list;
struct nvmap_handle *h;
bool vma_found = false;
size_t nr_page, i;
@@ -144,7 +144,7 @@ static void nvmap_vma_close(struct vm_area_struct *vma)
nr_page = h->size >> PAGE_SHIFT;
mutex_lock(&h->lock);
list_for_each_entry(vma_list, &h->vmas, list) {
list_for_each_entry_safe(vma_list, tmp_list, &h->vmas, list) {
if (vma_list->vma != vma)
continue;
if (atomic_dec_return(&vma_list->ref) == 0) {

5
drivers/video/tegra/nvmap/nvmap_ioctl.c
View File

@@ -1580,11 +1580,14 @@ int nvmap_ioctl_get_fd_from_list(struct file *filp, void __user *arg)
}
/* Create new handle for the size */
ref = nvmap_create_handle(client, hrange.sz, false);
if (IS_ERR_OR_NULL(ref))
if (IS_ERR_OR_NULL(ref)) {
err = -EINVAL;
goto free_hs;
}
ref->handle->orig_size = hrange.sz;
h = ref->handle;
mutex_init(&h->pg_ref_h_lock);
/* Assign pages from the handles to newly created nvmap handle */
err = nvmap_assign_pages_to_handle(client, hs, h, &hrange);