linux-kernel - [PATCH 1/2] Revert "UBIFS: Fix potential integer overflow in allocation"

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Date:   Sun,  1 Jul 2018 23:20:50 +0200
From:   Richard Weinberger <richard@....at>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
        Kees Cook <keescook@...omium.org>,
        Silvio Cesare <silvio.cesare@...il.com>, stable@...r.kernel.org
Subject: [PATCH 1/2] Revert "UBIFS: Fix potential integer overflow in allocation"

This reverts commit 353748a359f1821ee934afc579cf04572406b420.
It bypassed the linux-mtd review process and fixes the issue not as it
should.

Cc: Kees Cook <keescook@...omium.org>
Cc: Silvio Cesare <silvio.cesare@...il.com>
Cc: stable@...r.kernel.org
Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/ubifs/journal.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index 07b4956e0425..da8afdfccaa6 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -1282,11 +1282,10 @@ 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;
 
-- 
2.18.0