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authorJan Kara <jack@suse.cz>2013-02-05 13:59:56 +0100
committerBen Hutchings <ben@decadent.org.uk>2013-04-10 03:20:09 +0100
commit1b117cc2a4cd1adbbeb6a30ac73e50c68bc807e6 (patch)
tree2d503f8e95b639f899bb0eba973f359630431690 /fs
parentfe2e7c989d397460ce1df3ee7ba3aa8730d760b7 (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> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs')
-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 5142a82e3276..604f5fc764b5 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;
};