Don't ignore too long lines in nss_files (BZ #17079)

ChangeLog

@@ -1,3 +1,9 @@
+2014-06-23  Andreas Schwab  <schwab@suse.de>
+
+	[BZ #17079]
+	* nss/nss_files/files-XXX.c (get_contents): Store overflow marker
+	before reading the next line.
+
 2014-06-23  Will Newton  <will.newton@linaro.org>
 
 	* test-skeleton.c (signal_handler): Use printf and %m

NEWS

@@ -20,7 +20,7 @@ Version 2.20
   16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16912, 16915,
   16916, 16917, 16922, 16927, 16928, 16932, 16943, 16958, 16965, 16966,
   16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022, 17031, 17042,
-  17048, 17058, 17062, 17069, 17075.
+  17048, 17058, 17062, 17069, 17075, 17079.
 
 * Optimized strchr implementation for AArch64.  Contributed by ARM Ltd.
 

nss/nss_files/files-XXX.c

@@ -198,10 +198,12 @@ get_contents (char *linebuf, size_t len, FILE *stream)
     {
       int curlen = ((remaining_len > (size_t) INT_MAX) ? INT_MAX
 		    : remaining_len);
-      char *p = fgets_unlocked (curbuf, curlen, stream);
 
+      /* Terminate the line so that we can test for overflow.  */
       ((unsigned char *) curbuf)[curlen - 1] = 0xff;
 
+      char *p = fgets_unlocked (curbuf, curlen, stream);
+
       /* EOF or read error.  */
       if (p == NULL)
         return gcr_error;