Commit 89b1f39e authored Feb 05, 2013 by 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: Jan Kara <jack@suse.cz>

parent 99600051

fs/udf/udf_sb.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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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