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nss_files: Fix /etc/aliases null pointer dereference [BZ #24059]

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If /etc/aliases ends with a continuation line (a line that starts
with whitespace) which does not have a trailing newline character,
the file parser would crash due to a null pointer dereference.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2019-01-31 18:49:58 +01:00
parent de44ab67aa
commit 2bac7daa58
6 changed files with 98 additions and 0 deletions
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2
support/support_chroot.c
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@@ -56,6 +56,7 @@ support_chroot_create (struct support_chroot_configuration conf)
&chroot->path_resolv_conf);
write_file (path_etc, "hosts", conf.hosts, &chroot->path_hosts);
write_file (path_etc, "host.conf", conf.host_conf, &chroot->path_host_conf);
write_file (path_etc, "aliases", conf.aliases, &chroot->path_aliases);
free (path_etc);
@@ -77,5 +78,6 @@ support_chroot_free (struct support_chroot *chroot)
free (chroot->path_resolv_conf);
free (chroot->path_hosts);
free (chroot->path_host_conf);
free (chroot->path_aliases);
free (chroot);
}