ext4: check free inode count before allocating an inode
Recently, I ecountered some corrupted filesystems in which some groups' free inode counts were 65535, it seemed that free inode count was overflow. This patch teaches ext4 to check free inode count before allocaing an inode. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -697,6 +697,15 @@ got_group:
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if (!gdp)
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goto fail;
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/*
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* Check free inodes count before loading bitmap.
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*/
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if (ext4_free_inodes_count(sb, gdp) == 0) {
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if (++group == ngroups)
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group = 0;
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continue;
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}
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brelse(inode_bitmap_bh);
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inode_bitmap_bh = ext4_read_inode_bitmap(sb, group);
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if (!inode_bitmap_bh)
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