6.1-stable review patch. If anyone has any objections, please let me know.
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From: Hengqi Chen hengqi.chen@gmail.com
commit eb71f5c433e1c6dff089b315881dec40a88a7baf upstream.
The bpf_tail_call() index should be treated as a u32 value. Let's zero-extend it to avoid calling wrong BPF progs. See similar fixes for x86 [1]) and arm64 ([2]) for more details.
[1]: https://github.com/torvalds/linux/commit/90caccdd8cc0215705f18b92771b449b01e... [2]: https://github.com/torvalds/linux/commit/16338a9b3ac30740d49f5dfed81bac0ffa5...
Cc: stable@vger.kernel.org Fixes: 5dc615520c4d ("LoongArch: Add BPF JIT support") Signed-off-by: Hengqi Chen hengqi.chen@gmail.com Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/loongarch/net/bpf_jit.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/loongarch/net/bpf_jit.c +++ b/arch/loongarch/net/bpf_jit.c @@ -224,6 +224,8 @@ static int emit_bpf_tail_call(struct jit * goto out; */ tc_ninsn = insn ? ctx->offset[insn+1] - ctx->offset[insn] : ctx->offset[0]; + emit_zext_32(ctx, a2, true); + off = offsetof(struct bpf_array, map.max_entries); emit_insn(ctx, ldwu, t1, a1, off); /* bgeu $a2, $t1, jmp_offset */