linux-hardening - [PATCH v2] fs/ntfs3: use kcalloc() instead of kzalloc()

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Message-ID: <ZcszqPoW8RMaOvTN@nixos>
Date: Tue, 13 Feb 2024 03:17:28 -0600
From: Lenko Donchev <lenko.donchev@...il.com>
To: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: ntfs3@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH v2] fs/ntfs3: use kcalloc() instead of kzalloc()

We are trying to get rid of all multiplications from allocation
functions to prevent integer overflows[1]. Here the multiplication is
obviously safe, but using kcalloc() is more appropriate and improves
readability. This patch has no effect on runtime behavior.

Link: https://github.com/KSPP/linux/issues/162 [1]
Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [2]

Signed-off-by: Lenko Donchev <lenko.donchev@...il.com>
---
Changes in v2:
  - Use sizeof on actual pointer.
---
 fs/ntfs3/frecord.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c
index d435446537ca..725aa84dbd22 100644
--- a/fs/ntfs3/frecord.c
+++ b/fs/ntfs3/frecord.c
@@ -2636,7 +2636,7 @@ int ni_read_frame(struct ntfs_inode *ni, u64 frame_vbo, struct page **pages,
 		goto out1;
 	}
 
-	pages_disk = kzalloc(npages_disk, sizeof(struct page *), GFP_NOFS);
+	pages_disk = kcalloc(npages_disk, sizeof(*pages_disk), GFP_NOFS);
 	if (!pages_disk) {
 		err = -ENOMEM;
 		goto out2;
-- 
2.43.0