udf: Fix bitmap overflow on large filesystems with small block size
authorJan Kara <jack@suse.cz>
Tue, 5 Feb 2013 12:59:56 +0000 (13:59 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 28 Mar 2013 19:12:27 +0000 (12:12 -0700)
commitbc914c3b5ebcf158419c4901ec54ffbd7677d5a0
treedda7c66c9d090e3187eec3fb3390cd59b218d77a
parent5899ef0b272b58f2927eb3376afaad2b02559180
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>
fs/udf/udf_sb.h