bpf: Fix use-after-free in bpf_uprobe_multi_link_attach()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix use-after-free in bpf_uprobe_multi_link_attach() If bpf_link_prime() fails, bpf_uprobe_multi_link_attach() goes to the error_free label and frees the array of bpf_uprobe's without calling bpf_uprobe_unregister(). This leaks bpf_uprobe->uprobe and worse, this frees bpf_uprobe->consumer without removing it from the uprobe->consumers list.

References

• https://git.kernel.org/stable/c/790c630ab0e7d7aba6d186581d4627c09fce60f3
• https://git.kernel.org/stable/c/7c1d782e5afbf7c50ba74ecc4ddc18a05d63e5ee
• https://git.kernel.org/stable/c/cdf27834c3dd5d9abf7eb8e4ee87ee9e307eb25c
• https://git.kernel.org/stable/c/5fe6e308abaea082c20fbf2aa5df8e14495622cf