The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 9fc06ff56845cc5ccafec52f545fc2e08d22f849 Mon Sep 17 00:00:00 2001
From: Nikos Tsironis <ntsironis@xxxxxxxxxxx>
Date: Fri, 27 Mar 2020 16:01:10 +0200
Subject: [PATCH] dm clone: Add missing casts to prevent overflows and data
corruption
Add missing casts when converting from regions to sectors.
In case BITS_PER_LONG == 32, the lack of the appropriate casts can lead
to overflows and miscalculation of the device sector.
As a result, we could end up discarding and/or copying the wrong parts
of the device, thus corrupting the device's data.
Fixes: 7431b7835f55 ("dm: add clone target")
Cc: stable@xxxxxxxxxxxxxxx # v5.4+
Signed-off-by: Nikos Tsironis <ntsironis@xxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
diff --git a/drivers/md/dm-clone-target.c b/drivers/md/dm-clone-target.c
index 6ee85fb3388a..ca5020c58f7c 100644
--- a/drivers/md/dm-clone-target.c
+++ b/drivers/md/dm-clone-target.c
@@ -282,7 +282,7 @@ static bool bio_triggers_commit(struct clone *clone, struct bio *bio)
/* Get the address of the region in sectors */
static inline sector_t region_to_sector(struct clone *clone, unsigned long region_nr)
{
- return (region_nr << clone->region_shift);
+ return ((sector_t)region_nr << clone->region_shift);
}
/* Get the region number of the bio */
@@ -471,7 +471,7 @@ static void complete_discard_bio(struct clone *clone, struct bio *bio, bool succ
if (test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags) && success) {
remap_to_dest(clone, bio);
bio_region_range(clone, bio, &rs, &nr_regions);
- trim_bio(bio, rs << clone->region_shift,
+ trim_bio(bio, region_to_sector(clone, rs),
nr_regions << clone->region_shift);
generic_make_request(bio);
} else
@@ -804,11 +804,14 @@ static void hydration_copy(struct dm_clone_region_hydration *hd, unsigned int nr
struct dm_io_region from, to;
struct clone *clone = hd->clone;
+ if (WARN_ON(!nr_regions))
+ return;
+
region_size = clone->region_size;
region_start = hd->region_nr;
region_end = region_start + nr_regions - 1;
- total_size = (nr_regions - 1) << clone->region_shift;
+ total_size = region_to_sector(clone, nr_regions - 1);
if (region_end == clone->nr_regions - 1) {
/*
