Commit aa9ee4b1 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Greg Kroah-Hartman

dm integrity: fix deadlock with overlapping I/O

commit 4ed319c6 upstream.

dm-integrity will deadlock if overlapping I/O is issued to it, the bug
was introduced by commit 724376a0 ("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: 724376a0 ("dm integrity: implement fair range locks")
Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 469b40a4
......@@ -908,7 +908,7 @@ 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)
......@@ -954,8 +954,6 @@ 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)) {
......
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