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| author | Jan Kara <jack@suse.cz> | 2013-02-05 13:59:56 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-28 12:12:27 -0700 |
| commit | bc914c3b5ebcf158419c4901ec54ffbd7677d5a0 (patch) | |
| tree | dda7c66c9d090e3187eec3fb3390cd59b218d77a | |
| parent | 5899ef0b272b58f2927eb3376afaad2b02559180 (diff) | |
| download | lwn-bc914c3b5ebcf158419c4901ec54ffbd7677d5a0.tar.gz lwn-bc914c3b5ebcf158419c4901ec54ffbd7677d5a0.zip | |
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>
Cc: Jim Trigg <jtrigg@spamcop.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 42ad69ac9576..9e8e08ef246b 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; }; |