From a0a4f1c4f7d9d23d733cf3ae9685452364a58a70 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Wed, 23 May 2012 02:29:58 +0200
Subject: Fix bit shift validity

* ext2fs/balloc.c (ext2_new_block): When J & 31 is 31, replace 32bit right
shift with 0;
---
 ext2fs/balloc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'ext2fs')

diff --git a/ext2fs/balloc.c b/ext2fs/balloc.c
index 7333123c..8ad29cec 100644
--- a/ext2fs/balloc.c
+++ b/ext2fs/balloc.c
@@ -197,8 +197,11 @@ repeat:
 	     * The goal was occupied; search forward for a free
 	     * block within the next 32 blocks
 	   */
-	  lmap = ((((unsigned long *) bh)[j >> 5]) >>
-		  ((j & 31) + 1));
+	  if (j & 31 == 31)
+	    lmap = 0;
+	  else
+	    lmap = ((((unsigned long *) bh)[j >> 5]) >>
+		    ((j & 31) + 1));
 	  if (j < sblock->s_blocks_per_group - 32)
 	    lmap |= (((unsigned long *) bh)[(j >> 5) + 1]) <<
 	      (31 - (j & 31));
-- 
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