diff options
Diffstat (limited to 'resolv/nss_dns')
| -rw-r--r-- | resolv/nss_dns/dns-host.c | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c index 65a668e664..19ca33e197 100644 --- a/resolv/nss_dns/dns-host.c +++ b/resolv/nss_dns/dns-host.c @@ -342,6 +342,11 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, * (i.e., with the succeeding search-domain tacked on). */ n = strlen (bp) + 1; /* for the \0 */ + if (n >= MAXHOSTNAMELEN) + { + __set_h_errno (NO_RECOVERY); + return NSS_STATUS_TRYAGAIN; + } result->h_name = bp; bp += n; linebuflen -= n; @@ -396,11 +401,16 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, /* Store alias. */ *ap++ = bp; n = strlen (bp) + 1; /* For the \0. */ + if (n >= MAXHOSTNAMELEN) + { + ++had_error; + continue; + } bp += n; linebuflen -= n; /* Get canonical name. */ n = strlen (tbuf) + 1; /* For the \0. */ - if ((size_t) n > buflen) + if ((size_t) n > buflen || n >= MAXHOSTNAMELEN) { ++had_error; continue; @@ -423,7 +433,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, cp += n; /* Get canonical name. */ n = strlen (tbuf) + 1; /* For the \0. */ - if ((size_t) n > buflen) + if ((size_t) n > buflen || n >= MAXHOSTNAMELEN) { ++had_error; continue; @@ -469,6 +479,11 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, if (n != -1) { n = strlen (bp) + 1; /* for the \0 */ + if (n >= MAXHOSTNAMELEN) + { + ++had_error; + break; + } bp += n; linebuflen -= n; } @@ -478,6 +493,11 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, if (_res.options & RES_USE_INET6) { n = strlen (bp) + 1; /* for the \0 */ + if (n >= MAXHOSTNAMELEN) + { + ++had_error; + break; + } bp += n; linebuflen -= n; map_v4v6_hostent (result, &bp, &linebuflen); @@ -549,8 +569,8 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, if (result->h_name == NULL) { n = strlen (qname) + 1; /* For the \0. */ - if (n > linebuflen) - goto try_again; + if (n > linebuflen || n >= MAXHOSTNAMELEN) + goto no_recovery; strcpy (bp, qname); /* Cannot overflow. */ result->h_name = bp; bp += n; @@ -562,7 +582,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, *h_errnop = NETDB_SUCCESS; return NSS_STATUS_SUCCESS; } -try_again: - *h_errnop = TRY_AGAIN; + no_recovery: + *h_errnop = NO_RECOVERY; return NSS_STATUS_TRYAGAIN; } |