diff options
| -rw-r--r-- | drivers/md/dm-exception-store.c | 5 | ||||
| -rw-r--r-- | drivers/md/dm-snap-persistent.c | 22 |
2 files changed, 19 insertions, 8 deletions
diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c index 8719e3374ac..00832969f9a 100644 --- a/drivers/md/dm-exception-store.c +++ b/drivers/md/dm-exception-store.c @@ -191,6 +191,11 @@ int dm_exception_store_set_chunk_size(struct dm_exception_store *store, return -EINVAL; } + if (chunk_size_ulong > INT_MAX >> SECTOR_SHIFT) { + *error = "Chunk size is too high"; + return -EINVAL; + } + store->chunk_size = chunk_size_ulong; store->chunk_mask = chunk_size_ulong - 1; store->chunk_shift = ffs(chunk_size_ulong) - 1; diff --git a/drivers/md/dm-snap-persistent.c b/drivers/md/dm-snap-persistent.c index 2a171ce9a51..aa02fe54733 100644 --- a/drivers/md/dm-snap-persistent.c +++ b/drivers/md/dm-snap-persistent.c @@ -286,6 +286,7 @@ static int read_header(struct pstore *ps, int *new_snapshot) struct disk_header *dh; chunk_t chunk_size; int chunk_size_supplied = 1; + char *chunk_err; /* * Use default chunk size (or hardsect_size, if larger) if none supplied @@ -329,20 +330,25 @@ static int read_header(struct pstore *ps, int *new_snapshot) ps->version = le32_to_cpu(dh->version); chunk_size = le32_to_cpu(dh->chunk_size); - if (!chunk_size_supplied || ps->store->chunk_size == chunk_size) + if (ps->store->chunk_size == chunk_size) return 0; - DMWARN("chunk size %llu in device metadata overrides " - "table chunk size of %llu.", - (unsigned long long)chunk_size, - (unsigned long long)ps->store->chunk_size); + if (chunk_size_supplied) + DMWARN("chunk size %llu in device metadata overrides " + "table chunk size of %llu.", + (unsigned long long)chunk_size, + (unsigned long long)ps->store->chunk_size); /* We had a bogus chunk_size. Fix stuff up. */ free_area(ps); - ps->store->chunk_size = chunk_size; - ps->store->chunk_mask = chunk_size - 1; - ps->store->chunk_shift = ffs(chunk_size) - 1; + r = dm_exception_store_set_chunk_size(ps->store, chunk_size, + &chunk_err); + if (r) { + DMERR("invalid on-disk chunk size %llu: %s.", + (unsigned long long)chunk_size, chunk_err); + return r; + } r = dm_io_client_resize(sectors_to_pages(ps->store->chunk_size), ps->io_client); |