Revert "UBIFS: Fix potential integer overflow in allocation"

This reverts commit 353748a.
It bypassed the linux-mtd review process and fixes the issue not as it
should.

Cc: Kees Cook <[email protected]>
Cc: Silvio Cesare <[email protected]>
Cc: [email protected]
Signed-off-by: Richard Weinberger <[email protected]>

Author: richardweinberger

fs/ubifs/journal.c

@@ -1288,11 +1288,10 @@ static int truncate_data_node(const struct ubifs_info *c, const struct inode *in
 			      int *new_len)
 {
 	void *buf;
-	int err, compr_type;
-	u32 dlen, out_len, old_dlen;
+	int err, dlen, compr_type, out_len, old_dlen;
 
 	out_len = le32_to_cpu(dn->size);
-	buf = kmalloc_array(out_len, WORST_COMPR_FACTOR, GFP_NOFS);
+	buf = kmalloc(out_len * WORST_COMPR_FACTOR, GFP_NOFS);
 	if (!buf)
 		return -ENOMEM;