Commit 89b1f39e authored by Jan Kara's avatar Jan Kara

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

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: default avatarJan Kara <jack@suse.cz>
parent 99600051
...@@ -82,7 +82,7 @@ struct udf_virtual_data { ...@@ -82,7 +82,7 @@ struct udf_virtual_data {
struct udf_bitmap { struct udf_bitmap {
__u32 s_extLength; __u32 s_extLength;
__u32 s_extPosition; __u32 s_extPosition;
__u16 s_nr_groups; int s_nr_groups;
struct buffer_head **s_block_bitmap; struct buffer_head **s_block_bitmap;
}; };
......
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