6.12-stable review patch. If anyone has any objections, please let me know.
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From: Radim Krčmář rkrcmar@ventanamicro.com
commit 8a16586fa7b8a01360890d284896b90c217dca44 upstream.
emit_ld is wrong, because thread_info.cpu is 32-bit, not xlen-bit wide. The struct currently has a hole after cpu, so little endian accesses seemed fine.
Fixes: 2ddec2c80b44 ("riscv, bpf: inline bpf_get_smp_processor_id()") Cc: stable@vger.kernel.org Signed-off-by: Radim Krčmář rkrcmar@ventanamicro.com Reviewed-by: Pu Lehui pulehui@huawei.com Link: https://lore.kernel.org/r/20250812090256.757273-4-rkrcmar@ventanamicro.com Signed-off-by: Paul Walmsley pjw@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/riscv/net/bpf_jit_comp64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/riscv/net/bpf_jit_comp64.c +++ b/arch/riscv/net/bpf_jit_comp64.c @@ -1557,7 +1557,7 @@ int bpf_jit_emit_insn(const struct bpf_i */ if (insn->src_reg == 0 && insn->imm == BPF_FUNC_get_smp_processor_id) { /* Load current CPU number in R0 */ - emit_ld(bpf_to_rv_reg(BPF_REG_0, ctx), offsetof(struct thread_info, cpu), + emit_lw(bpf_to_rv_reg(BPF_REG_0, ctx), offsetof(struct thread_info, cpu), RV_REG_TP, ctx); break; }