Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper()  tee_dyn_shm_alloc_helper() derives nr_pages from a caller-supplied size and passes it to alloc_pages_exact() without checking it. For size == 0 nr_pages is 0, and alloc_pages_exact(0) calls get_order(0), which is documented as undefined and returns BITS_PER_LONG - PAGE_SHIFT. The page allocator then trips its order > MAX_PAGE_ORDER warning and fails the allocation; on a panic_on_warn kernel that ends the boot.  This can be triggered by TEE_IOC_SHM_ALLOC with struct tee_ioctl_shm_alloc_data where size is 0.  Reject a zero page count, as register_shm_helper() already does for the register path.
Data source: kernel.org (416baaa9-dc9f-4396-8d5f-8c081fb06d67)