Messages in this thread Patch in this message | | | From | Luis Henriques <> | Subject | [PATCH 020/102] udf: Fix bitmap overflow on large filesystems with small block size | Date | Mon, 8 Apr 2013 10:49:35 +0100 |
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3.5.7.10 -stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara <jack@suse.cz>
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: Luis Henriques <luis.henriques@canonical.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 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; }; -- 1.8.1.2
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