linux-ext4 - [PATCH e2fsprogs] fix test in ext2fs_check_desc() for inode table within block group

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Message-ID: <46A12E22.3030102@redhat.com>
Date:	Fri, 20 Jul 2007 16:50:26 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH e2fsprogs] fix test in ext2fs_check_desc() for inode table
 within block group

The test in ext2fs_check_desc() is off by one; if the inode table
goes all the way to the last block of the block group, it will 
falsely assert that it has extended past it.  The last block
of a range is start + len -1, not start + len.

Testcase to follow.

Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Index: e2fsprogs-1.40.2/lib/ext2fs/check_desc.c
===================================================================
--- e2fsprogs-1.40.2.orig/lib/ext2fs/check_desc.c
+++ e2fsprogs-1.40.2/lib/ext2fs/check_desc.c
@@ -61,7 +61,7 @@ errcode_t ext2fs_check_desc(ext2_filsys 
 		 */
 		if (fs->group_desc[i].bg_inode_table < first_block ||
 		    ((fs->group_desc[i].bg_inode_table +
-		      fs->inode_blocks_per_group) > last_block))
+		      fs->inode_blocks_per_group - 1) > last_block))
 			return EXT2_ET_GDESC_BAD_INODE_TABLE;
 	}
 	return 0;

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