ext4: use kmalloc_array() for array space allocation

Replace kmalloc(size * sizeof) with kmalloc_array() for safer memory
allocation and overflow prevention.

Cc: [email protected]
Signed-off-by: Liao Yuanhong <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Theodore Ts'o <[email protected]>

Author: Liao Yuanhong

fs/ext4/orphan.c

@@ -589,8 +589,9 @@ int ext4_init_orphan_info(struct super_block *sb)
 	}
 	oi->of_blocks = inode->i_size >> sb->s_blocksize_bits;
 	oi->of_csum_seed = EXT4_I(inode)->i_csum_seed;
-	oi->of_binfo = kmalloc(oi->of_blocks*sizeof(struct ext4_orphan_block),
-			       GFP_KERNEL);
+	oi->of_binfo = kmalloc_array(oi->of_blocks,
+				     sizeof(struct ext4_orphan_block),
+				     GFP_KERNEL);
 	if (!oi->of_binfo) {
 		ret = -ENOMEM;
 		goto out_put;