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udf: Fix bitmap overflow on large filesystems with small block size

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commit 89b1f39eb4 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>
This commit is contained in:
Jan Kara
2013-02-05 13:59:56 +01:00
committed by Greg Kroah-Hartman
parent b842701f3d
commit 7f2cb127ef
1 changed files with 1 additions and 1 deletions
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2
fs/udf/udf_sb.h
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@@ -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;
};