| From 9777db9d2c37350538e45355a9f849cc707e98b1 Mon Sep 17 00:00:00 2001 |
| From: Jan Kara <jack@suse.cz> |
| Date: Tue, 5 Feb 2013 13:59:56 +0100 |
| Subject: [PATCH] udf: Fix bitmap overflow on large filesystems with small |
| block size |
| |
| commit 89b1f39eb4189de745fae554b0d614d87c8d5c63 upstream. |
| |
| 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 <jack@suse.cz> |
| Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> |
| --- |
| 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 d113b72c2768..efa82c91ec18 100644 |
| --- a/fs/udf/udf_sb.h |
| +++ b/fs/udf/udf_sb.h |
| @@ -78,7 +78,7 @@ 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; |
| }; |
| |
| -- |
| 1.8.5.2 |
| |
