In ext2fs_block_alloc_stats_range(), the quantity "-inuse * n" is
calculated as a signed 32-bit quantity. Unfortunately, gcc (4.6.3 on
Ubuntu 12.04) doesn't sign-extend this quantity to fill the blk64_t
parameter that ext2fs_free_blocks_count_add() wants, so the end result
is that the superblock gets a ridiculously huge free block count.
Changing the declaration of 'n' to blk64_t seems to fix this.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
lib/ext2fs/alloc_stats.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/ext2fs/alloc_stats.c b/lib/ext2fs/alloc_stats.c
index 5bb86ef..4feb24d 100644
--- a/lib/ext2fs/alloc_stats.c
+++ b/lib/ext2fs/alloc_stats.c
@@ -129,7 +129,7 @@ void ext2fs_block_alloc_stats_range(ext2_filsys fs, blk64_t blk,
while (num) {
int group = ext2fs_group_of_blk2(fs, blk);
blk64_t last_blk = ext2fs_group_last_block2(fs, group);
- blk_t n = num;
+ blk64_t n = num;
if (blk + num > last_blk)
n = last_blk - blk + 1;
--
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