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zebra: Don't leak memory in rtadv.c code on shutdown

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The adata variable was being leaked on shutdown since
it was calloc'ed.  There is no need to make this dynamic
memory.  Just choose a size and use that.  Add a bit
of code to ensure that if it's not large enough,
it will just stop and the developer will fix it.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2023-12-12 13:29:47 -05:00
parent 9393d36690
commit 8fcacf6803
3 changed files with 16 additions and 17 deletions
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2
zebra/main.c
View File

@ -432,6 +432,8 @@ int main(int argc, char **argv)
zebra_vty_init();
access_list_init();
prefix_list_init();
rtadv_init();
rtadv_cmd_init();
/* PTM socket */
#ifdef ZEBRA_PTM_SUPPORT

30
zebra/rtadv.c
View File

@ -33,6 +33,7 @@
extern struct zebra_privs_t zserv_privs;
static uint32_t interfaces_configured_for_ra_from_bgp;
#define RTADV_ADATA_SIZE 1024
#if defined(HAVE_RTADV)
@ -187,8 +188,9 @@ static void rtadv_send_packet(int sock, struct interface *ifp,
struct cmsghdr *cmsgptr;
struct in6_pktinfo *pkt;
struct sockaddr_in6 addr;
static void *adata = NULL;
unsigned char buf[RTADV_MSG_SIZE];
char adata[RTADV_ADATA_SIZE];
struct nd_router_advert *rtadv;
int ret;
int len = 0;
@ -199,22 +201,6 @@ static void rtadv_send_packet(int sock, struct interface *ifp,
struct listnode *node;
uint16_t pkt_RouterLifetime;
/*
* Allocate control message bufffer. This is dynamic because
* CMSG_SPACE is not guaranteed not to call a function. Note that
* the size will be different on different architectures due to
* differing alignment rules.
*/
if (adata == NULL) {
/* XXX Free on shutdown. */
adata = calloc(1, CMSG_SPACE(sizeof(struct in6_pktinfo)));
if (adata == NULL) {
zlog_debug("%s: can't malloc control data", __func__);
exit(-1);
}
}
/* Logging of packet. */
if (IS_ZEBRA_DEBUG_PACKET)
zlog_debug("%s(%s:%u): Tx RA, socket %u", ifp->name,
@ -3069,3 +3055,13 @@ uint32_t rtadv_get_interfaces_configured_from_bgp(void)
{
return interfaces_configured_for_ra_from_bgp;
}
void rtadv_init(void)
{
if (CMSG_SPACE(sizeof(struct in6_pktinfo)) > RTADV_ADATA_SIZE) {
zlog_debug("%s: RTADV_ADATA_SIZE choosen will not work on this platform, please use a larger size",
__func__);
exit(-1);
}
}

1
zebra/rtadv.h
View File

@ -435,6 +435,7 @@ extern void zebra_interface_radv_enable(ZAPI_HANDLER_ARGS);
extern uint32_t rtadv_get_interfaces_configured_from_bgp(void);
extern bool rtadv_compiled_in(void);
extern void rtadv_init(void);
#ifdef __cplusplus
}