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syslogd: fix memory leaks in main(..) and allowaddr(..)

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- main(..): free memory assigned to fdsr before calling die(..).
- allowaddr(..): free memory assigned to ap before returning from the
  function early. Add a `err` goto label to reduce freeaddrinfo/free(ap)
  logic duplication.

MFC after:	1 week
X-MFC notes:	some of this is dependent on refactoring not MFCed
Reported by:	clang static analyzer, Coverity
CID:		1367750 (ap leakage in allowaddr(..))
Submitted by:	Tom Rix <trix@juniper.net>
Reviewed by:	ngie
Sponsored by:	Dell EMC Isilon, Juniper
Differential Revision:	D10004
This commit is contained in:
Enji Cooper 2017-03-15 18:15:30 +00:00
parent 870952f562
commit a393b6c82f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=315322
1 changed files with 18 additions and 12 deletions
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30
usr.sbin/syslogd/syslogd.c
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@ -685,8 +685,10 @@ main(int argc, char *argv[])
reapchild(WantReapchild);
if (MarkSet)
markit();
if (WantDie)
if (WantDie) {
free(fdsr);
die(WantDie);
}
bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
sizeof(fd_mask));
@ -2438,7 +2440,7 @@ allowaddr(char *s)
struct allowedpeer *ap;
struct servent *se;
int masklen = -1;
struct addrinfo hints, *res;
struct addrinfo hints, *res = NULL;
#ifdef INET
in_addr_t *addrp, *maskp;
#endif
@ -2465,8 +2467,9 @@ allowaddr(char *s)
ap->port = ntohs(se->s_port);
} else {
ap->port = strtol(cp1, &cp2, 0);
/* port not numeric */
if (*cp2 != '\0')
return (-1); /* port not numeric */
goto err;
}
} else {
if ((se = getservbyname("syslog", "udp")))
@ -2480,7 +2483,7 @@ allowaddr(char *s)
strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
*cp1 = '\0';
if ((masklen = atoi(cp1 + 1)) < 0)
return (-1);
goto err;
}
#ifdef INET6
if (*s == '[') {
@ -2526,8 +2529,7 @@ allowaddr(char *s)
/* convert masklen to netmask */
*maskp = htonl(~((1 << (32 - masklen)) - 1));
} else {
freeaddrinfo(res);
return (-1);
goto err;
}
/* Lose any host bits in the network number. */
*addrp &= *maskp;
@ -2535,10 +2537,9 @@ allowaddr(char *s)
#endif
#ifdef INET6
case AF_INET6:
if (masklen > 128) {
freeaddrinfo(res);
return (-1);
}
if (masklen > 128)
goto err;
if (masklen < 0)
masklen = 128;
mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0];
@ -2559,8 +2560,7 @@ allowaddr(char *s)
break;
#endif
default:
freeaddrinfo(res);
return (-1);
goto err;
}
freeaddrinfo(res);
} else {
@ -2596,7 +2596,13 @@ allowaddr(char *s)
printf("port = %d\n", ap->port);
}
#endif
return (0);
err:
if (res != NULL)
freeaddrinfo(res);
free(ap);
return (-1);
}
/*