CVE-2021-47081

In the Linux kernel, the following vulnerability has been resolved:
habanalabs/gaudi: Fix a potential use after free in
gaudi_memset_device_memory Our code analyzer reported a uaf. In
gaudi_memset_device_memory, cb is get via hl_cb_kernel_create() with 2
refcount. If hl_cs_allocate_job() failed, the execution runs into
release_cb branch. One ref of cb is dropped by hl_cb_put(cb) and could be
freed if other thread also drops one ref. Then cb is used by cb->id later,
which is a potential uaf. My patch add a variable ‘id’ to accept the value
of cb->id before the hl_cb_put(cb) is called, to avoid the potential uaf.