[PATCH] interface-ip: fix memory corruption bug when using jail network namespaces

[junnanx.xu at gmail.com]

From: Junnan Xu <junnanx.xu at gmail.com>

memory corruption when resolv_conf specified by input -r parameters
and the resolv_conf length less than "/tmp/resolv.conf-.d/resolv.conf.auto"

Signed-off-by: Junnan Xu <junnanx.xu at gmail.com>
---
 interface-ip.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/interface-ip.c b/interface-ip.c
index 585cb6f..ab4a5cf 100644
--- a/interface-ip.c
+++ b/interface-ip.c
@@ -1566,7 +1566,9 @@ __interface_write_dns_entries(FILE *f, const char *jail)
 void
 interface_write_resolv_conf(const char *jail)
 {
-	size_t plen = (jail ? strlen(jail) + 1 : 0 ) + strlen(resolv_conf) + 1;
+	size_t plen = (jail ? strlen(jail) + 1 : 0 ) +
+	    (strlen(resolv_conf) >= strlen(DEFAULT_RESOLV_CONF) ?
+	    strlen(resolv_conf) : strlen(DEFAULT_RESOLV_CONF) ) + 1;
 	char *path = alloca(plen);
 	char *dpath = alloca(plen);
 	char *tmppath = alloca(plen + 4);
-- 
2.36.1.windows.1