resolv: Fix file handle leak in __resolv_conf_load [BZ #25429]

res_vinit_1 did not close the stream on errors, only on success.
This change moves closing the stream to __resolv_conf_load, for both
the success and error cases.

Fixes commit 89f187a40fc0ad4e22838526bfe34d73f758b776 ("resolv: Use
getline for configuration file reading in res_vinit_1") and commit
3f853f22c87f0b671c0366eb290919719fa56c0e ("resolv: Lift domain search
list limits [BZ #19569] [BZ #21475]"), where memory allocation was
introduced into res_vinit_1.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

diff --git a/resolv/res_init.c b/resolv/res_init.c
index 95dce09..0934571 100644 (file)
--- a/resolv/res_init.c
+++ b/resolv/res_init.c
@@ -508,7 +508,6 @@ res_vinit_1 (FILE *fp, struct resolv_conf_parser *parser)
               continue;
             }
         }
-      fclose (fp);
     }
   if (__glibc_unlikely (nameserver_list_size (&parser->nameserver_list) == 0))
     {
@@ -593,6 +592,13 @@ __resolv_conf_load (struct __res_state *preinit)
     }
   resolv_conf_parser_free (&parser);
 
+  if (fp != NULL)
+    {
+      int saved_errno = errno;
+      fclose (fp);
+      __set_errno (saved_errno);
+    }
+
   return conf;
 }