diff options
| author | Jan Kara <jack@suse.cz> | 2013-02-05 13:59:56 +0100 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2014-02-10 16:11:32 -0500 |
| commit | 8d0ad4e77355f6e8beb2adc421c9b8586a1071fc (patch) | |
| tree | 30885cfd398169ee92fbd7b907f129ca9f86193c | |
| parent | cd50b96209b07d1e650f037dcdcb5ceb862c4445 (diff) | |
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>
| -rw-r--r-- | fs/udf/udf_sb.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h index d113b72c276..efa82c91ec1 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; }; |