[PATCH] locale: don't crash if locale-archive is an empty file

[Aurelien Jarno]

In case of power failure followed by filesystem issues locale-archive
can end-up containing all zeros. In that case all calls to setlocale()
generate a SIGFPE. This renders a system with a default non-C locale
unbootable.

Avoid this by ignoring the locale instead of generating a SIGFPE.
---
 locale/loadarchive.c | 4 ++++
 1 file changed, 4 insertions(+)

2013-11-29  Aurelien Jarno <aurelien@aurel32.net>

	* locale/loadarchive.c (_nl_load_locale_from_archive): Avoid
	division by 0.

diff --git a/locale/loadarchive.c b/locale/loadarchive.c
index 70136dc..7cfc498 100644
--- a/locale/loadarchive.c
+++ b/locale/loadarchive.c
@@ -274,6 +274,10 @@ _nl_load_locale_from_archive (int category, const char **namep)
   namehashtab = (struct namehashent *) ((char *) head
 					+ head->namehash_offset);
 
+  /* Avoid division by 0 if the file is corrupted.  */
+  if (__builtin_expect (head->namehash_size == 0, 0))
+    goto close_and_out;
+
   idx = hval % head->namehash_size;
   incr = 1 + hval % (head->namehash_size - 2);
 
-- 
1.8.4.2