[PATCH 5/8] habanalabs: fix vma fields assignments order in hl_hw_block_mmap()

From: Oded Gabbay
Date: Sun Jul 31 2022 - 06:51:03 EST


From: Tomer Tayar <ttayar@xxxxxxxxx>

In hl_hw_block_mmap(), the vma's 'vm_private_data' and 'vm_ops' fields
are assigned before filling the content of the private data.
In between there is a call to the ASIC hw_block_mmap() function, and if
it fails, the vma close function will be called with a bad private data
value.
Fix the order of assignments to avoid this issue.

In hl_hw_block_mmap() the vma's 'vm_private_data and vm_ops are assigned
before setting the

Signed-off-by: Tomer Tayar <ttayar@xxxxxxxxx>
Reviewed-by: Oded Gabbay <ogabbay@xxxxxxxxxx>
Signed-off-by: Oded Gabbay <ogabbay@xxxxxxxxxx>
---
drivers/misc/habanalabs/common/memory.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
index 0698c3c363bd..a027fa88889b 100644
--- a/drivers/misc/habanalabs/common/memory.c
+++ b/drivers/misc/habanalabs/common/memory.c
@@ -1492,23 +1492,22 @@ int hl_hw_block_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
if (!lnode)
return -ENOMEM;

- vma->vm_ops = &hw_block_vm_ops;
- vma->vm_private_data = lnode;
-
- hl_ctx_get(ctx);
-
rc = hdev->asic_funcs->hw_block_mmap(hdev, vma, block_id, block_size);
if (rc) {
- hl_ctx_put(ctx);
kfree(lnode);
return rc;
}

+ hl_ctx_get(ctx);
+
lnode->ctx = ctx;
lnode->vaddr = vma->vm_start;
lnode->size = block_size;
lnode->id = block_id;

+ vma->vm_private_data = lnode;
+ vma->vm_ops = &hw_block_vm_ops;
+
mutex_lock(&ctx->hw_block_list_lock);
list_add_tail(&lnode->node, &ctx->hw_block_mem_list);
mutex_unlock(&ctx->hw_block_list_lock);
--
2.25.1