package/network/services/dnsmasq/patches/0040-Fix-crash-when-negative-SRV-response-over-TCP-gets-s.patch

   1 From e710c34469af4378c2db6fa0b0be88313adcb68f Mon Sep 17 00:00:00 2001
   2 From: Alin Nastac <alin.nastac@gmail.com>
   3 Date: Mon, 30 Sep 2019 15:30:26 +0100
   4 Subject: [PATCH] Fix crash when negative SRV response over TCP gets stored in
   5  LRU cache entry.
   6
   7 Patch extended to receive side of pipe by SRK.
   8 ---
   9  src/cache.c | 8 ++++++--
  10  1 file changed, 6 insertions(+), 2 deletions(-)
  11
  12 --- a/src/cache.c
  13 +++ b/src/cache.c
  14 @@ -665,7 +665,11 @@ void cache_end_insert(void)
  15               if (flags & (F_IPV4 | F_IPV6 | F_DNSKEY | F_DS | F_SRV))
  16                 read_write(daemon->pipe_to_parent, (unsigned char *)&new_chain->addr, sizeof(new_chain->addr), 0);
  17               if (flags & F_SRV)
  18 -                blockdata_write(new_chain->addr.srv.target, new_chain->addr.srv.targetlen, daemon->pipe_to_parent);
  19 +               {
  20 +                 /* A negative SRV entry is possible and has no data, obviously. */
  21 +                 if (!(flags & F_NEG))
  22 +                   blockdata_write(new_chain->addr.srv.target, new_chain->addr.srv.targetlen, daemon->pipe_to_parent);
  23 +               }
  24  #ifdef HAVE_DNSSEC
  25               if (flags & F_DNSKEY)
  26                 {
  27 @@ -737,7 +741,7 @@ int cache_recv_insert(time_t now, int fd
  28           if (!read_write(fd, (unsigned char *)&addr, sizeof(addr), 1))
  29             return 0;
  30
  31 -         if (flags & F_SRV && !(addr.srv.target = blockdata_read(fd, addr.srv.targetlen)))
  32 +         if ((flags & F_SRV) && !(flags & F_NEG) && !(addr.srv.target = blockdata_read(fd, addr.srv.targetlen)))
  33             return 0;
  34
  35  #ifdef HAVE_DNSSEC