[PATCH 1/3] daemon: handle gethostbyname() error
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DORMANTno replies
From: René Scharfe <hidden>
Date: 2016-06-15 23:02:37
Subsystem:
the rest · Maintainer:
Linus Torvalds
If the user-supplied hostname can't be found then we should not use it. We already avoid doing that in the non-NO_IPV6 case by checking if the return value of getaddrinfo() is zero (success). Do the same in the NO_IPV6 case and make sure the return value of gethostbyname() isn't NULL before dereferencing this pointer. Signed-off-by: Rene Scharfe <redacted> --- Most lines are just re-indented, not actually changed. daemon.c | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/daemon.c b/daemon.c
index 4dcfff9..a6f467e 100644
--- a/daemon.c
+++ b/daemon.c@@ -553,20 +553,21 @@ static void parse_host_arg(char *extra_args, int buflen) static char addrbuf[HOST_NAME_MAX + 1]; hent = gethostbyname(hostname); + if (hent) { + ap = hent->h_addr_list; + memset(&sa, 0, sizeof sa); + sa.sin_family = hent->h_addrtype; + sa.sin_port = htons(0); + memcpy(&sa.sin_addr, *ap, hent->h_length); + + inet_ntop(hent->h_addrtype, &sa.sin_addr, + addrbuf, sizeof(addrbuf)); - ap = hent->h_addr_list; - memset(&sa, 0, sizeof sa); - sa.sin_family = hent->h_addrtype; - sa.sin_port = htons(0); - memcpy(&sa.sin_addr, *ap, hent->h_length); - - inet_ntop(hent->h_addrtype, &sa.sin_addr, - addrbuf, sizeof(addrbuf)); - - free(canon_hostname); - canon_hostname = xstrdup(hent->h_name); - free(ip_address); - ip_address = xstrdup(addrbuf); + free(canon_hostname); + canon_hostname = xstrdup(hent->h_name); + free(ip_address); + ip_address = xstrdup(addrbuf); + } #endif } }
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2.1.2