From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20130411202557.680957604@goodmis.org> Date: Thu, 11 Apr 2013 16:26:13 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jan Kara Subject: [ 070/171 ] udf: Fix bitmap overflow on large filesystems with small block size References: <20130411202503.783159048@goodmis.org> Content-Disposition: inline; filename=0070-udf-Fix-bitmap-overflow-on-large-filesystems-with-sm.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.6.11.2 stable review patch. If anyone has any objections, please let me know. ------------------ From: Jan Kara [ Upstream commit 89b1f39eb4189de745fae554b0d614d87c8d5c63 ] For large UDF filesystems with 512-byte blocks the number of necessary bitmap blocks is larger than 2^16 so s_nr_groups in udf_bitmap overflows (the number will overflow for filesystems larger than 128 GB with 512-byte blocks). That results in ENOSPC errors despite the filesystem has plenty of free space. Fix the problem by changing s_nr_groups' type to 'int'. That is enough even for filesystems 2^32 blocks (UDF maximum) and 512-byte blocksize. Reported-and-tested-by: v10lator@myway.de Signed-off-by: Jan Kara Signed-off-by: Steven Rostedt --- fs/udf/udf_sb.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h index 42ad69a..9e8e08e 100644 --- a/fs/udf/udf_sb.h +++ b/fs/udf/udf_sb.h @@ -82,7 +82,7 @@ struct udf_virtual_data { struct udf_bitmap { __u32 s_extLength; __u32 s_extPosition; - __u16 s_nr_groups; + int s_nr_groups; struct buffer_head **s_block_bitmap; }; -- 1.7.10.4