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| author | Roland McGrath <roland@gnu.org> | 2002-11-18 04:10:15 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 2002-11-18 04:10:15 +0000 |
| commit | 9b57c1c1e4c6889f47b200bcefe77f16becd2095 (patch) | |
| tree | f39b189035c84a36febcf825e13d76339d9afd19 /resolv/nss_dns | |
| parent | 502328b25830408ad6d8c5d6adf86fe88f3f10d6 (diff) | |
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2002-11-14 Paul Eggert <eggert@twionsun.com>
* resolv/nss_dns/dns-network.c (getanswer_r): Check for buffer
overflow when skipping the question part and when unpacking
aliases.
Diffstat (limited to 'resolv/nss_dns')
| -rw-r--r-- | resolv/nss_dns/dns-network.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/resolv/nss_dns/dns-network.c b/resolv/nss_dns/dns-network.c index 5956c84382..fdab996837 100644 --- a/resolv/nss_dns/dns-network.c +++ b/resolv/nss_dns/dns-network.c @@ -283,7 +283,15 @@ getanswer_r (const querybuf *answer, int anslen, struct netent *result, /* Skip the question part. */ while (question_count-- > 0) - cp += __dn_skipname (cp, end_of_message) + QFIXEDSZ; + { + int n = __dn_skipname (cp, end_of_message); + if (n < 0 || end_of_message - (cp + n) < QFIXEDSZ) + { + __set_h_errno (NO_RECOVERY); + return NSS_STATUS_UNAVAIL; + } + cp += n + QFIXEDSZ; + } alias_pointer = result->n_aliases = &net_data->aliases[0]; *alias_pointer = NULL; @@ -344,12 +352,15 @@ getanswer_r (const querybuf *answer, int anslen, struct netent *result, return NSS_STATUS_UNAVAIL; } cp += n; - *alias_pointer++ = bp; - n = strlen (bp) + 1; - bp += n; - linebuflen -= n; - result->n_addrtype = class == C_IN ? AF_INET : AF_UNSPEC; - ++have_answer; + if (alias_pointer + 2 < &net_data->aliases[MAX_NR_ALIASES]) + { + *alias_pointer++ = bp; + n = strlen (bp) + 1; + bp += n; + linebuflen -= n; + result->n_addrtype = class == C_IN ? AF_INET : AF_UNSPEC; + ++have_answer; + } } } |