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-rw-r--r--fs/ext4/super.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1484a087bba0..32e3ecb35cd7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1997,6 +1997,17 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1997 1997
1998 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 1998 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1999 goto cantfind_ext4; 1999 goto cantfind_ext4;
2000
2001 /* ensure blocks_count calculation below doesn't sign-extend */
2002 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2003 le32_to_cpu(es->s_first_data_block) + 1) {
2004 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2005 "first data block %u, blocks per group %lu\n",
2006 ext4_blocks_count(es),
2007 le32_to_cpu(es->s_first_data_block),
2008 EXT4_BLOCKS_PER_GROUP(sb));
2009 goto failed_mount;
2010 }
2000 blocks_count = (ext4_blocks_count(es) - 2011 blocks_count = (ext4_blocks_count(es) -
2001 le32_to_cpu(es->s_first_data_block) + 2012 le32_to_cpu(es->s_first_data_block) +
2002 EXT4_BLOCKS_PER_GROUP(sb) - 1); 2013 EXT4_BLOCKS_PER_GROUP(sb) - 1);