dm writecache: use 2-factor allocator arguments

This adjusts the allocator calls to use the 2-factor argument style, as
already done treewide for better defense against allocator overflows.

Signed-off-by: Kees Cook <keescook@chromium.org>
[snitzer: tweaked code to leave assignment in a test alone]
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index 5961c77..07ea6a4 100644 (file)
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -259,7 +259,7 @@ static int persistent_memory_claim(struct dm_writecache *wc)
        if (da != p) {
                long i;
                wc->memory_map = NULL;
-               pages = kvmalloc(p * sizeof(struct page *), GFP_KERNEL);
+               pages = kvmalloc_array(p, sizeof(struct page *), GFP_KERNEL);
                if (!pages) {
                        r = -ENOMEM;
                        goto err2;
@@ -859,7 +859,7 @@ static int writecache_alloc_entries(struct dm_writecache *wc)
 
        if (wc->entries)
                return 0;
-       wc->entries = vmalloc(sizeof(struct wc_entry) * wc->n_blocks);
+       wc->entries = vmalloc(array_size(sizeof(struct wc_entry), wc->n_blocks));
        if (!wc->entries)
                return -ENOMEM;
        for (b = 0; b < wc->n_blocks; b++) {
@@ -1481,9 +1481,9 @@ static void __writecache_writeback_pmem(struct dm_writecache *wc, struct writeba
                wb->bio.bi_iter.bi_sector = read_original_sector(wc, e);
                wb->page_offset = PAGE_SIZE;
                if (max_pages <= WB_LIST_INLINE ||
-                   unlikely(!(wb->wc_list = kmalloc(max_pages * sizeof(struct wc_entry *),
-                                                    GFP_NOIO | __GFP_NORETRY |
-                                                    __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
+                   unlikely(!(wb->wc_list = kmalloc_array(max_pages, sizeof(struct wc_entry *),
+                                                          GFP_NOIO | __GFP_NORETRY |
+                                                          __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
                        wb->wc_list = wb->wc_list_inline;
                        max_pages = WB_LIST_INLINE;
                }