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-rw-r--r--lib/test_bpf.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index f8d2b2a..ea60ad8 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -158,6 +158,18 @@ static struct bpf_test tests[] = {
{ { 0, 0x800000ff }, { 1, 0x800000ff } },
},
{
+ "LD_IMM_0",
+ .u.insns = {
+ BPF_STMT(BPF_LD | BPF_IMM, 0), /* ld #0 */
+ BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0, 1, 0),
+ BPF_STMT(BPF_RET | BPF_K, 0),
+ BPF_STMT(BPF_RET | BPF_K, 1),
+ },
+ CLASSIC,
+ { },
+ { { 1, 1 } },
+ },
+ {
"LD_IND",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_LEN, 0),
@@ -1734,12 +1746,11 @@ static int probe_filter_length(struct sock_filter *fp)
{
int len = 0;
- while (fp->code != 0 || fp->k != 0) {
- fp++;
- len++;
- }
+ for (len = MAX_INSNS - 1; len > 0; --len)
+ if (fp[len].code != 0 || fp[len].k != 0)
+ break;
- return len;
+ return len + 1;
}
static struct sk_filter *generate_filter(int which, int *err)