memstick/ms_block: Fix some incorrect memory allocation

Some functions of the bitmap API take advantage of the fact that a bitmap
is an array of long.

So, to make sure this assertion is correct, allocate bitmaps with
bitmap_zalloc() instead of kzalloc()+hand-computed number of bytes.

While at it, also use bitmap_free() instead of kfree() to keep the
semantic.

Fixes: 0ab30494bc4f ("memstick: add support for legacy memorysticks")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/dbf633c48c24ae6d95f852557e8d8b3bbdef65fe.1656155715.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c
index 3993bdd..f8f1511 100644 (file)
--- a/drivers/memstick/core/ms_block.c
+++ b/drivers/memstick/core/ms_block.c
@@ -1341,17 +1341,17 @@ static int msb_ftl_initialize(struct msb_data *msb)
        msb->zone_count = msb->block_count / MS_BLOCKS_IN_ZONE;
        msb->logical_block_count = msb->zone_count * 496 - 2;
 
-       msb->used_blocks_bitmap = kzalloc(msb->block_count / 8, GFP_KERNEL);
-       msb->erased_blocks_bitmap = kzalloc(msb->block_count / 8, GFP_KERNEL);
+       msb->used_blocks_bitmap = bitmap_zalloc(msb->block_count, GFP_KERNEL);
+       msb->erased_blocks_bitmap = bitmap_zalloc(msb->block_count, GFP_KERNEL);
        msb->lba_to_pba_table =
                kmalloc_array(msb->logical_block_count, sizeof(u16),
                              GFP_KERNEL);
 
        if (!msb->used_blocks_bitmap || !msb->lba_to_pba_table ||
                                                !msb->erased_blocks_bitmap) {
-               kfree(msb->used_blocks_bitmap);
+               bitmap_free(msb->used_blocks_bitmap);
+               bitmap_free(msb->erased_blocks_bitmap);
                kfree(msb->lba_to_pba_table);
-               kfree(msb->erased_blocks_bitmap);
                return -ENOMEM;
        }
 
@@ -1946,7 +1946,7 @@ static DEFINE_MUTEX(msb_disk_lock); /* protects against races in open/release */
 static void msb_data_clear(struct msb_data *msb)
 {
        kfree(msb->boot_page);
-       kfree(msb->used_blocks_bitmap);
+       bitmap_free(msb->used_blocks_bitmap);
        kfree(msb->lba_to_pba_table);
        kfree(msb->cache);
        msb->card = NULL;