Module: kamailio Branch: master Commit: 7ea3b97c8acf8b623563b7a9fbf4ba23ea3e9170 URL: https://github.com/kamailio/kamailio/commit/7ea3b97c8acf8b623563b7a9fbf4ba2… Author: Daniel-Constantin Mierla &lt;miconda(a)gmail.com&gt; Committer: Daniel-Constantin Mierla &lt;miconda(a)gmail.com&gt; Date: 2021-04-08T11:37:08+02:00 core: dns cache - safety checks for rdata field --- Modified: src/core/dns_cache.c --- Diff: https://github.com/kamailio/kamailio/commit/7ea3b97c8acf8b623563b7a9fbf4ba2… Patch: https://github.com/kamailio/kamailio/commit/7ea3b97c8acf8b623563b7a9fbf4ba2… --- diff --git a/src/core/dns_cache.c b/src/core/dns_cache.c index 9a63a5bd21..7dbde8f378 100644 --- a/src/core/dns_cache.c +++ b/src/core/dns_cache.c @@ -4012,7 +4012,7 @@ static struct dns_hash_entry *dns_cache_clone_entry(struct dns_hash_entry *e, size = e->total_size; if (rdata_size) { /* we have to extend the entry */ - rounded_size = ROUND_POINTER(size); /* size may not have been + rounded_size = ROUND_POINTER(size); /* size may not have been rounded previously */ switch (e->type) { case T_A: @@ -4064,7 +4064,7 @@ static struct dns_hash_entry *dns_cache_clone_entry(struct dns_hash_entry *e, /* fix the pointers inside the rr structures */ last_rr = NULL; for (rr=new->rr_lst; rr; rr=rr->next) { - rr->rdata = (void*)translate_pointer((char*)new, (char*)e, + rr->rdata = (void*)translate_pointer((char*)new, (char*)e, (char*)rr->rdata); if (rr->next) rr->next = (struct dns_rr*)translate_pointer((char*)new, (char*)e, @@ -4074,6 +4074,10 @@ static struct dns_hash_entry *dns_cache_clone_entry(struct dns_hash_entry *e, switch(e->type){ case T_NAPTR: + if(rr->rdata==NULL) { + LM_WARN("null rdata filed for type: %u\n", e->type); + break; + } /* there are pointers inside the NAPTR rdata stucture */ ((struct naptr_rdata*)rr->rdata)->flags = translate_pointer((char*)new, (char*)e, @@ -4092,6 +4096,10 @@ static struct dns_hash_entry *dns_cache_clone_entry(struct dns_hash_entry *e, ((struct naptr_rdata*)rr->rdata)->repl); break; case T_TXT: + if(rr->rdata==NULL) { + LM_WARN("null rdata filed for type: %u\n", e->type); + break; + } /* there are pointers inside the TXT structure */ for (i=0; i<((struct txt_rdata*)rr->rdata)->cstr_no; i++){ ((struct txt_rdata*)rr->rdata)->txt[i].cstr= @@ -4100,6 +4108,10 @@ static struct dns_hash_entry *dns_cache_clone_entry(struct dns_hash_entry *e, } break; case T_EBL: + if(rr->rdata==NULL) { + LM_WARN("null rdata filed for type: %u\n", e->type); + break; + } /* there are pointers inside the EBL structure */ ((struct ebl_rdata*)rr->rdata)->separator = translate_pointer((char*)new, (char*)e, @@ -4140,7 +4152,7 @@ static struct dns_hash_entry *dns_cache_clone_entry(struct dns_hash_entry *e, * If there is an existing record with the same name and value * (ip address in case of A/AAAA record, name in case of SRV record) * only the remaining fields are updated. - * + * * Note that permanent records cannot be overwritten unless * the new record is also permanent. A permanent record * completely replaces a non-permanent one.