bpf: fix check array size

Array ins_chk in lib/librte_bpf/bpf_validate.c has 255 entries.
So the instruction with opcode == 255 will reading beyond array
boundaries.
For more details please refer to:
https://bugs.dpdk.org/show_bug.cgi?id=283

Fixes: 6e12ec4c4d6d ("bpf: add more checks")
Cc: stable@dpdk.org
Reported-by: Michel Machado <michel@digirati.com.br>
Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

diff --git a/lib/librte_bpf/bpf_validate.c b/lib/librte_bpf/bpf_validate.c
index 83983ef..d0e683b 100644 (file)
--- a/lib/librte_bpf/bpf_validate.c
+++ b/lib/librte_bpf/bpf_validate.c
@@ -1084,7 +1084,7 @@ eval_jcc(struct bpf_verifier *bvf, const struct ebpf_insn *ins)
 /*
  * validate parameters for each instruction type.
  */
-static const struct bpf_ins_check ins_chk[UINT8_MAX] = {
+static const struct bpf_ins_check ins_chk[UINT8_MAX + 1] = {
        /* ALU IMM 32-bit instructions */
        [(BPF_ALU | BPF_ADD | BPF_K)] = {
                .mask = {.dreg = WRT_REGS, .sreg = ZERO_REG},