From: Luke Nelson lukenels@cs.washington.edu
[ Upstream commit 745abfaa9eafa597d31fdf24a3249e5206a98768 ]
This patch fixes an off by one error in the RV32 JIT handling for BPF tail call. Currently, the code decrements TCC before checking if it is less than zero. This limits the maximum number of tail calls to 32 instead of 33 as in other JITs. The fix is to instead check the old value of TCC before decrementing.
Fixes: 5f316b65e99f ("riscv, bpf: Add RV32G eBPF JIT") Signed-off-by: Luke Nelson luke.r.nels@gmail.com Signed-off-by: Alexei Starovoitov ast@kernel.org Acked-by: Xi Wang xi.wang@gmail.com Link: https://lore.kernel.org/bpf/20200421002804.5118-1-luke.r.nels@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/net/bpf_jit_comp32.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/net/bpf_jit_comp32.c b/arch/riscv/net/bpf_jit_comp32.c index 302934177760..11083d4d5f2d 100644 --- a/arch/riscv/net/bpf_jit_comp32.c +++ b/arch/riscv/net/bpf_jit_comp32.c @@ -770,12 +770,13 @@ static int emit_bpf_tail_call(int insn, struct rv_jit_context *ctx) emit_bcc(BPF_JGE, lo(idx_reg), RV_REG_T1, off, ctx);
/* - * if ((temp_tcc = tcc - 1) < 0) + * temp_tcc = tcc - 1; + * if (tcc < 0) * goto out; */ emit(rv_addi(RV_REG_T1, RV_REG_TCC, -1), ctx); off = (tc_ninsn - (ctx->ninsns - start_insn)) << 2; - emit_bcc(BPF_JSLT, RV_REG_T1, RV_REG_ZERO, off, ctx); + emit_bcc(BPF_JSLT, RV_REG_TCC, RV_REG_ZERO, off, ctx);
/* * prog = array->ptrs[index];