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Harald Welte gerrit-no-reply at lists.osmocom.orgHarald Welte has uploaded this change for review. ( https://gerrit.osmocom.org/13569 Change subject: ggsn: Remove magic numbers from ipcp_contains_option() ...................................................................... ggsn: Remove magic numbers from ipcp_contains_option() Let's remove some magic numbers and use a data structure instead. Change-Id: I5b1abc6f403f85986407e9e8359924dfcb58031a --- M ggsn/ggsn.c 1 file changed, 7 insertions(+), 6 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-ggsn refs/changes/69/13569/1 diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c index 2c0d64e..2d1368b 100644 --- a/ggsn/ggsn.c +++ b/ggsn/ggsn.c @@ -419,14 +419,15 @@ const uint8_t *cur_opt = ipcp + sizeof(struct ipcp_hdr); /* iterate over Options and check if protocol contained */ - while (cur_opt + 2 <= ipcp + ipcp_len) { - uint8_t type = cur_opt[0]; - uint8_t len = cur_opt[1]; /* length value includes 2 bytes type/length */ - if (len < 2) + while (cur_opt + sizeof(struct ipcp_option_hdr) <= ipcp + ipcp_len) { + const struct ipcp_option_hdr *cur_opt_hdr = (const struct ipcp_option_hdr *)cur_opt; + /* length value includes 2 bytes type/length */ + if (cur_opt_hdr->len < sizeof(struct ipcp_option_hdr)) return NULL; - if (type == opt && len >= 2 + opt_minlen) + if (cur_opt_hdr->type == opt && + cur_opt_hdr->len >= sizeof(struct ipcp_option_hdr) + opt_minlen) return cur_opt; - cur_opt += len; + cur_opt += cur_opt_hdr->len; } return NULL; } -- To view, visit https://gerrit.osmocom.org/13569 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-ggsn Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: I5b1abc6f403f85986407e9e8359924dfcb58031a Gerrit-Change-Number: 13569 Gerrit-PatchSet: 1 Gerrit-Owner: Harald Welte <laforge at gnumonks.org> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20190410/981cc378/attachment.htm>