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| author | Nick Mathewson <nickm@torproject.org> | 2019-09-10 11:07:25 -0400 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2019-09-10 11:07:25 -0400 |
| commit | 97f7efa9e3316e4e8970a87a1ee53fd4fd0075d8 (patch) | |
| tree | 452a8a39dba1beda29c5511db22321d5c252edaa | |
| parent | 51475aee57523318d0b0a9e47dedad89ef1b578c (diff) | |
| download | tor-97f7efa9e3316e4e8970a87a1ee53fd4fd0075d8.tar.gz tor-97f7efa9e3316e4e8970a87a1ee53fd4fd0075d8.zip | |
pf: when extracting an IPv6 address, make sure we got an IPv6 address
Our code assumes that when we're configured to get IPv6 addresses
out of a TRANS_PF transparent proxy connection, we actually will.
But we didn't check that, and so FreeBSD started warning us about a
potential NULL pointer dereference.
Fixes part of bug 31687; bugfix on 0.2.3.4-alpha when this code was
added.
| -rw-r--r-- | changes/ticket31687_2 | 5 | ||||
| -rw-r--r-- | src/core/or/connection_edge.c | 7 |
2 files changed, 10 insertions, 2 deletions
diff --git a/changes/ticket31687_2 b/changes/ticket31687_2 new file mode 100644 index 0000000000..eadc698275 --- /dev/null +++ b/changes/ticket31687_2 @@ -0,0 +1,5 @@ + o Minor bugfixes (FreeBSD, PF-based proxy, IPv6): + - When extracting an IPv6 address from a PF-based proxy, verify + that we are actually configured to receive an IPv6 address, + and log an internal error if not. Fixes part of bug 31687; + bugfix on 0.2.3.4-alpha. diff --git a/src/core/or/connection_edge.c b/src/core/or/connection_edge.c index e4b3455d13..7cc67d7f5e 100644 --- a/src/core/or/connection_edge.c +++ b/src/core/or/connection_edge.c @@ -2547,8 +2547,11 @@ destination_from_pf(entry_connection_t *conn, socks_request_t *req) } else if (proxy_sa->sa_family == AF_INET6) { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)proxy_sa; pnl.af = AF_INET6; - memcpy(&pnl.saddr.v6, tor_addr_to_in6(&ENTRY_TO_CONN(conn)->addr), - sizeof(struct in6_addr)); + const struct in6_addr *dest_in6 = + tor_addr_to_in6(&ENTRY_TO_CONN(conn)->addr); + if (BUG(!dest_in6)) + return -1; + memcpy(&pnl.saddr.v6, dest_in6, sizeof(struct in6_addr)); pnl.sport = htons(ENTRY_TO_CONN(conn)->port); memcpy(&pnl.daddr.v6, &sin6->sin6_addr, sizeof(struct in6_addr)); pnl.dport = sin6->sin6_port; |