diff options
Diffstat (limited to 'src/gsm')
| -rw-r--r-- | src/gsm/ipa.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/src/gsm/ipa.c b/src/gsm/ipa.c index 7cff1e81..dac20122 100644 --- a/src/gsm/ipa.c +++ b/src/gsm/ipa.c @@ -89,6 +89,11 @@ const char *ipa_ccm_idtag_name(uint8_t tag) int ipa_ccm_idtag_parse(struct tlv_parsed *dec, unsigned char *buf, int len) { + return ipa_ccm_idtag_parse_off(dec, buf, len, 0); +} + +int ipa_ccm_idtag_parse_off(struct tlv_parsed *dec, unsigned char *buf, int len, const int len_offset) +{ uint8_t t_len; uint8_t t_tag; uint8_t *cur = buf; @@ -100,6 +105,11 @@ int ipa_ccm_idtag_parse(struct tlv_parsed *dec, unsigned char *buf, int len) t_len = *cur++; t_tag = *cur++; + if (t_len < len_offset) { + LOGP(DLMI, LOGL_ERROR, "minimal offset not included: %d\n", t_len); + return -EINVAL; + } + if (t_len > len + 1) { LOGP(DLMI, LOGL_ERROR, "The tag does not fit: %d\n", t_len); return -EINVAL; @@ -107,11 +117,11 @@ int ipa_ccm_idtag_parse(struct tlv_parsed *dec, unsigned char *buf, int len) DEBUGPC(DLMI, "%s='%s' ", ipa_ccm_idtag_name(t_tag), cur); - dec->lv[t_tag].len = t_len; + dec->lv[t_tag].len = t_len - len_offset; dec->lv[t_tag].val = cur; - cur += t_len; - len -= t_len; + cur += t_len - len_offset; + len -= t_len - len_offset; } return 0; } |