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NULL pointer deref of partially uninitialized uvm_parent_gpu_t in error path #978

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NULL pointer deref of partially uninitialized uvm_parent_gpu_t in error path #978

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5 changes: 3 additions & 2 deletions kernel-open/nvidia-uvm/uvm_pmm_gpu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3477,11 +3477,12 @@ void uvm_pmm_gpu_device_p2p_init(uvm_parent_gpu_t *parent_gpu)

void uvm_pmm_gpu_device_p2p_deinit(uvm_parent_gpu_t *parent_gpu)
{
unsigned long pci_start_pfn = pci_resource_start(parent_gpu->pci_dev,
uvm_device_p2p_static_bar(parent_gpu)) >> PAGE_SHIFT;
unsigned long pci_start_pfn;
struct page *p2p_page;

if (parent_gpu->device_p2p_initialised && !uvm_parent_gpu_is_coherent(parent_gpu)) {
pci_start_pfn = pci_resource_start(parent_gpu->pci_dev,
uvm_device_p2p_static_bar(parent_gpu)) >> PAGE_SHIFT;
p2p_page = pfn_to_page(pci_start_pfn);
devm_memunmap_pages(&parent_gpu->pci_dev->dev, page_pgmap(p2p_page));
}
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