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authorJan Kara <jack@suse.cz>2013-02-05 13:59:56 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-28 12:06:04 -0700
commit400ac274e9c84f439a2e419bcb392aefbd9f4a3e (patch)
treec874675635561fec8bbd1cb6cf6f4ab2102eef28
parent28a4b1b70dd44e8e4ab9df6e84e776911902313e (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> Cc: Jim Trigg <jtrigg@spamcop.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/udf/udf_sb.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index 4858c191242b..54706dca277b 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -79,7 +79,7 @@ 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;
};