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ospfclient: Provide some protection against blindly trusting input

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Coverity rightly points out that blindly trusting the lsalen
from received data may not be the smartest thing to do.  Add
a bit of code to prevent us from blindly malloc'ing
too much memory.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2020-10-05 16:19:09 -04:00
parent e13013d4ba
commit d7b4f53a0f
1 changed files with 17 additions and 2 deletions
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19
ospfclient/ospf_apiclient.c
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@ -49,6 +49,7 @@
#include "ospfd/ospf_route.h"
#include "ospfd/ospf_zebra.h"
#include "ospfd/ospf_api.h"
#include "ospfd/ospf_errors.h"
#include "ospf_apiclient.h"
@ -564,12 +565,19 @@ static void ospf_apiclient_handle_lsa_update(struct ospf_apiclient *oclient,
{
struct msg_lsa_change_notify *cn;
struct lsa_header *lsa;
int lsalen;
uint16_t lsalen;
cn = (struct msg_lsa_change_notify *)STREAM_DATA(msg->s);
/* Extract LSA from message */
lsalen = ntohs(cn->data.length);
if (lsalen > OSPF_MAX_LSA_SIZE) {
flog_warn(
EC_OSPF_LARGE_LSA,
"%s: message received size: %d is greater than a LSA size: %d",
__func__, lsalen, OSPF_MAX_LSA_SIZE);
return;
}
lsa = XMALLOC(MTYPE_OSPF_APICLIENT, lsalen);
memcpy(lsa, &(cn->data), lsalen);
@ -589,12 +597,19 @@ static void ospf_apiclient_handle_lsa_delete(struct ospf_apiclient *oclient,
{
struct msg_lsa_change_notify *cn;
struct lsa_header *lsa;
int lsalen;
uint16_t lsalen;
cn = (struct msg_lsa_change_notify *)STREAM_DATA(msg->s);
/* Extract LSA from message */
lsalen = ntohs(cn->data.length);
if (lsalen > OSPF_MAX_LSA_SIZE) {
flog_warn(
EC_OSPF_LARGE_LSA,
"%s: message received size: %d is greater than a LSA size: %d",
__func__, lsalen, OSPF_MAX_LSA_SIZE);
return;
}
lsa = XMALLOC(MTYPE_OSPF_APICLIENT, lsalen);
memcpy(lsa, &(cn->data), lsalen);