3.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jan Kara <jack@xxxxxxx>
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@xxxxxxxx
Signed-off-by: Jan Kara <jack@xxxxxxx>
Cc: Jim Trigg <jtrigg@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/udf/udf_sb.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 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;
};
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