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Fix dangling arch pointer in gen_bpf #498

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Fix dangling arch pointer in gen_bpf #498

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24 changes: 18 additions & 6 deletions src/gen_bpf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2030,32 +2030,44 @@ static int _gen_bpf_build_bpf(struct bpf_state *state,

/* generate the badarch action */
b_badarch = _gen_bpf_action(state, NULL, state->attr->act_badarch);
if (b_badarch == NULL)
if (b_badarch == NULL) {
state->arch = NULL;
return -ENOMEM;
}
rc = _hsh_add(state, &b_badarch, 1);
if (rc < 0)
if (rc < 0) {
state->arch = NULL;
return rc;
}
state->bad_arch_hsh = b_badarch->hash;

/* generate the default action */
b_default = _gen_bpf_action(state, NULL, state->attr->act_default);
if (b_default == NULL)
if (b_default == NULL) {
state->arch = NULL;
return -ENOMEM;
}
rc = _hsh_add(state, &b_default, 0);
if (rc < 0)
if (rc < 0) {
state->arch = NULL;
return rc;
}
state->def_hsh = b_default->hash;

/* load the architecture token/number */
_BPF_INSTR(instr, _BPF_OP(state->arch, BPF_LD + BPF_ABS),
_BPF_JMP_NO, _BPF_JMP_NO, _BPF_ARCH(state->arch));
b_head = _blk_append(state, NULL, &instr);
if (b_head == NULL)
if (b_head == NULL) {
state->arch = NULL;
return -ENOMEM;
}
b_head->acc_end = _ACC_STATE_OFFSET(_BPF_OFFSET_ARCH);
rc = _hsh_add(state, &b_head, 1);
if (rc < 0)
if (rc < 0) {
state->arch = NULL;
return rc;
}
b_tail = b_head;

/* generate the per-architecture filters */
Expand Down