1 files changed, 12 insertions, 26 deletions

diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c
index 556acff3952..7dbe652efb5 100644
--- a/drivers/md/dm-exception-store.c
+++ b/drivers/md/dm-exception-store.c
@@ -138,16 +138,6 @@ int dm_exception_store_type_unregister(struct dm_exception_store_type *type)
 }
 EXPORT_SYMBOL(dm_exception_store_type_unregister);
 
-/*
- * Round a number up to the nearest 'size' boundary.  size must
- * be a power of 2.
- */
-static ulong round_up(ulong n, ulong size)
-{
-        size--;
-        return (n + size) & ~size;
-}
-
 static int set_chunk_size(struct dm_exception_store *store,
                           const char *chunk_size_arg, char **error)
 {
@@ -155,7 +145,8 @@ static int set_chunk_size(struct dm_exception_store *store,
         char *value;
 
         chunk_size_ulong = simple_strtoul(chunk_size_arg, &value, 10);
-        if (*chunk_size_arg == '\0' || *value != '\0') {
+        if (*chunk_size_arg == '\0' || *value != '\0' ||
+            chunk_size_ulong > UINT_MAX) {
                 *error = "Invalid chunk size";
                 return -EINVAL;
         }
@@ -165,40 +156,35 @@ static int set_chunk_size(struct dm_exception_store *store,
                 return 0;
         }
 
-        /*
-         * Chunk size must be multiple of page size.  Silently
-         * round up if it's not.
-         */
-        chunk_size_ulong = round_up(chunk_size_ulong, PAGE_SIZE >> 9);
-
-        return dm_exception_store_set_chunk_size(store, chunk_size_ulong,
+        return dm_exception_store_set_chunk_size(store,
+                                                 (unsigned) chunk_size_ulong,
                                                  error);
 }
 
 int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
-                                      unsigned long chunk_size_ulong,
+                                      unsigned chunk_size,
                                       char **error)
 {
         /* Check chunk_size is a power of 2 */
-        if (!is_power_of_2(chunk_size_ulong)) {
+        if (!is_power_of_2(chunk_size)) {
                 *error = "Chunk size is not a power of 2";
                 return -EINVAL;
         }
 
         /* Validate the chunk size against the device block size */
-        if (chunk_size_ulong % (bdev_logical_block_size(store->cow->bdev) >> 9)) {
+        if (chunk_size % (bdev_logical_block_size(store->cow->bdev) >> 9)) {
                 *error = "Chunk size is not a multiple of device blocksize";
                 return -EINVAL;
         }
 
-        if (chunk_size_ulong > INT_MAX >> SECTOR_SHIFT) {
+        if (chunk_size > 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;
+        store->chunk_size = chunk_size;
+        store->chunk_mask = chunk_size - 1;
+        store->chunk_shift = ffs(chunk_size) - 1;
 
         return 0;
 }
@@ -251,7 +237,7 @@ int dm_exception_store_create(struct dm_target *ti, int argc, char **argv,
 
         r = set_chunk_size(tmp_store, argv[2], &ti->error);
         if (r)
-                goto bad_cow;
+                goto bad_ctr;
 
         r = type->ctr(tmp_store, 0, NULL);
         if (r) {