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- fix a race condition in dm-integrity

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Merge tag 'for-6.11/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fix from Mikulas Patocka:

 - fix a race condition in dm-integrity

* tag 'for-6.11/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm-integrity: fix a race condition when accessing recalc_sector
This commit is contained in:
Linus Torvalds 2024-09-11 11:21:50 -07:00
commit 3857c7b041
1 changed files with 3 additions and 1 deletions
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4
drivers/md/dm-integrity.c
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@ -2174,6 +2174,7 @@ static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map
struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
unsigned int journal_section, journal_entry;
unsigned int journal_read_pos;
sector_t recalc_sector;
struct completion read_comp;
bool discard_retried = false;
bool need_sync_io = ic->internal_hash && dio->op == REQ_OP_READ;
@ -2314,6 +2315,7 @@ static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map
goto lock_retry;
}
}
recalc_sector = le64_to_cpu(ic->sb->recalc_sector);
spin_unlock_irq(&ic->endio_wait.lock);
if (unlikely(journal_read_pos != NOT_FOUND)) {
@ -2368,7 +2370,7 @@ static void dm_integrity_map_continue(struct dm_integrity_io *dio, bool from_map
if (need_sync_io) {
wait_for_completion_io(&read_comp);
if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING) &&
dio->range.logical_sector + dio->range.n_sectors > le64_to_cpu(ic->sb->recalc_sector))
dio->range.logical_sector + dio->range.n_sectors > recalc_sector)
goto skip_check;
if (ic->mode == 'B') {
if (!block_bitmap_op(ic, ic->recalc_bitmap, dio->range.logical_sector,