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Merge tag 'for-7.1/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

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Pull device mapper fix from Mikulas Patocka:

 - fix metadata corruption in dm-thin

* tag 'for-7.1/dm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm-thin: fix metadata refcount underflow
This commit is contained in:
Linus Torvalds
2026-04-27 16:33:23 -07:00
parent a7cc308da5 09a65adc7d
commit d762a96e3d
1 changed files with 8 additions and 0 deletions
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8
drivers/md/persistent-data/dm-btree-remove.c
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@@ -490,12 +490,20 @@ static int rebalance_children(struct shadow_spine *s,
if (le32_to_cpu(n->header.nr_entries) == 1) {
struct dm_block *child;
int is_shared;
dm_block_t b = value64(n, 0);
r = dm_tm_block_is_shared(info->tm, b, &is_shared);
if (r)
return r;
r = dm_tm_read_lock(info->tm, b, &btree_node_validator, &child);
if (r)
return r;
if (is_shared)
inc_children(info->tm, dm_block_data(child), vt);
memcpy(n, dm_block_data(child),
dm_bm_block_size(dm_tm_get_bm(info->tm)));