CVE-2026-89906

In the Linux kernel, the following vulnerability has been resolved:

LoongArch: BPF: Refactor jump offset calculation in tail call

The old macro-based jmp_offset calculation derives the jump distance from a stale prior-pass code stride, which can lead to wrong branch offsets and soft lockups under extra JIT passes.

Fix this by calculating the offset directly on the absolute target: "ctx->offset[insn + 1] - ctx->idx".

To avoid a false 16-bit range check abort during size estimation, add a "ctx->image == NULL" guard to inject a safe dummy offset.