riscv, bpf: Fix potential NULL dereference

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: riscv, bpf: Fix potential NULL dereference The bpf_jit_binary_free() function requires a non-NULL argument. When the RISC-V BPF JIT fails to converge in NR_JIT_ITERATIONS steps, jit_data->header will be NULL, which triggers a NULL dereference. Avoid this by checking the argument, prior calling the function.

References

• https://git.kernel.org/stable/c/cac6b043cea3e120f4fccec16f7381747cbfdc0d
• https://git.kernel.org/stable/c/e1b80a5ebe5431caeb20f88c32d4a024777a2d41
• https://git.kernel.org/stable/c/27de809a3d83a6199664479ebb19712533d6fd9b