[bgpd] Fix infinite loop in community_str2com
2006-03-30 Paul Jakma <paul.jakma@sun.com>
* bgp_community.c: (community_gettoken) Unknown token should
return NULL, to give a strong indication to callers that
the token no longer can be parsed, otherwise callers looping
on this function may have a hard time ending their loop.
(community_str2com) While loop around community_gettoken appears
to have been coded thinking that break statement would break
from the while{}, hence it could never exit for unknown token
case. Fix it to do..while, so it can use the NULL result from
community_gettoken easily.
diff --git a/bgpd/bgp_community.c b/bgpd/bgp_community.c
index 3033db1..b419a20 100644
--- a/bgpd/bgp_community.c
+++ b/bgpd/bgp_community.c
@@ -520,7 +520,7 @@
/* Unknown string. */
*token = community_token_unknown;
- return p;
+ return NULL;
}
/* Community value. */
@@ -538,7 +538,7 @@
if (separator)
{
*token = community_token_unknown;
- return p;
+ return NULL;
}
else
{
@@ -559,14 +559,14 @@
if (! digit)
{
*token = community_token_unknown;
- return p;
+ return NULL;
}
*val = community_high + community_low;
*token = community_token_val;
return p;
}
*token = community_token_unknown;
- return p;
+ return NULL;
}
/* convert string to community structure */
@@ -578,8 +578,10 @@
u_int32_t val;
enum community_token token;
- while ((str = community_gettoken (str, &token, &val)))
+ do
{
+ str = community_gettoken (str, &token, &val);
+
switch (token)
{
case community_token_val:
@@ -596,7 +598,7 @@
community_free (com);
break;
}
- }
+ } while (str);
if (! com)
return NULL;