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authorMikulas Patocka <mpatocka@redhat.com>2019-04-05 15:26:39 -0400
committerMike Snitzer <snitzer@redhat.com>2019-04-05 18:49:08 -0400
commit4ed319c6ac08e9a28fca7ac188181ac122f4de84 (patch)
treeb7b1c42338a40692cde5a854406b61adb2c4d3c9 /drivers/md
parentbcb44433bba5eaff293888ef22ffa07f1f0347d6 (diff)
downloadlinux-4ed319c6ac08e9a28fca7ac188181ac122f4de84.tar.gz
dm integrity: fix deadlock with overlapping I/O
dm-integrity will deadlock if overlapping I/O is issued to it, the bug was introduced by commit 724376a04d1a ("dm integrity: implement fair range locks"). Users rarely use overlapping I/O so this bug went undetected until now. Fix this bug by correcting, likely cut-n-paste, typos in ranges_overlap() and also remove a flawed ranges_overlap() check in remove_range_unlocked(). This condition could leave unprocessed bios hanging on wait_list forever. Cc: stable@vger.kernel.org # v4.19+ Fixes: 724376a04d1a ("dm integrity: implement fair range locks") Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-integrity.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 94b865c5ce71..7c678f50aaa3 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -913,7 +913,7 @@ static void copy_from_journal(struct dm_integrity_c *ic, unsigned section, unsig
static bool ranges_overlap(struct dm_integrity_range *range1, struct dm_integrity_range *range2)
{
return range1->logical_sector < range2->logical_sector + range2->n_sectors &&
- range2->logical_sector + range2->n_sectors > range2->logical_sector;
+ range1->logical_sector + range1->n_sectors > range2->logical_sector;
}
static bool add_new_range(struct dm_integrity_c *ic, struct dm_integrity_range *new_range, bool check_waiting)
@@ -959,8 +959,6 @@ static void remove_range_unlocked(struct dm_integrity_c *ic, struct dm_integrity
struct dm_integrity_range *last_range =
list_first_entry(&ic->wait_list, struct dm_integrity_range, wait_entry);
struct task_struct *last_range_task;
- if (!ranges_overlap(range, last_range))
- break;
last_range_task = last_range->task;
list_del(&last_range->wait_entry);
if (!add_new_range(ic, last_range, false)) {