LoongArch: BPF: Refactor jump offset calculation in tail call

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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.

Cc: stable@vger.kernel.org
Fixes: cd39d9e6b7 ("LoongArch: BPF: Fix jump offset calculation in tailcall")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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Tiezhu Yang 2026-08-17 22:07:23 +08:00 • committed by Huacai Chen

parent cd7e356b07

commit 37d545d12f

1 changed files with 4 additions and 8 deletions

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arch/loongarch/net/bpf_jit.c

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