The f_lotsbad regression test was failing on some systems
with:
@@ -26,6 +61,7 @@
Restarting e2fsck from the beginning...
Pass 1: Checking inodes, blocks, and sizes
+Illegal block number passed to ext2fs_test_block_bitmap #0 for in-use block map
Pass 2: Checking directory structure
Entry 'termcap' in / (2) has deleted/unused inode 12. Clear? yes
Running with valgrind (./test_script --valgrind f_lotsbad) we
see:
+==31409== Conditional jump or move depends on uninitialised value(s)
+==31409== at 0x42927A: ext2fs_test_generic_bmap (gen_bitmap64.c:378)
among others.
Looking at gen_bitmap64.c:
376: arg >>= bitmap->cluster_bits;
377:
378: if ((arg < bitmap->start) || (arg > bitmap->end)) {
A little more debugging showed that it was actually
bitmap->cluster_bits which was uninitialized, because it never
gets copied over in ext2fs_copy_generic_bmap()
Patch below resolves the issue.
Reported-by: Andreas Dilger <adilger@xxxxxxxxxxxxx>
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
diff --git a/lib/ext2fs/gen_bitmap64.c b/lib/ext2fs/gen_bitmap64.c
index f75876d..80c9f7a 100644
--- a/lib/ext2fs/gen_bitmap64.c
+++ b/lib/ext2fs/gen_bitmap64.c
@@ -193,6 +193,7 @@ errcode_t ext2fs_copy_generic_bmap(ext2fs_generic_bitmap src,
new_bmap->real_end = src->real_end;
new_bmap->bitmap_ops = src->bitmap_ops;
new_bmap->base_error_code = src->base_error_code;
+ new_bmap->cluster_bits = src->cluster_bits;
descr = src->description;
if (descr) {
--
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