linux-kernel - [PATCH 4/4] gntdev: Unchecked finction result

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20240229133119.638432-1-shum.sdl@nppct.ru>
Date: Thu, 29 Feb 2024 16:31:19 +0300
From: Andrey Shumilin <shum.sdl@...ct.ru>
To: Juergen Gross <jgross@...e.com>
Cc: Andrey Shumilin <shum.sdl@...ct.ru>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org,
	khoroshilov@...ras.ru,
	ykarpov@...ras.ru,
	vmerzlyakov@...ras.ru,
	vefanov@...ras.ru
Subject: [PATCH 4/4] gntdev: Unchecked finction result

The dma_coerce_mask_and_coherent function may refuse
to apply a mask due to incorrectly passed parameters.
But since this function returns the error -EIO, this
is an abnormal situation and the error must be written to the log.

Signed-off-by: Andrey Shumilin <shum.sdl@...ct.ru>
Found by Linux Verification Center (linuxtesting.org) with SVACE.
---
 drivers/xen/gntdev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 61faea1f0663..8a448dbbca86 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -597,7 +597,8 @@ static int gntdev_open(struct inode *inode, struct file *flip)
 	flip->private_data = priv;
 #ifdef CONFIG_XEN_GRANT_DMA_ALLOC
 	priv->dma_dev = gntdev_miscdev.this_device;
-	dma_coerce_mask_and_coherent(priv->dma_dev, DMA_BIT_MASK(64));
+	if (dma_coerce_mask_and_coherent(priv->dma_dev, DMA_BIT_MASK(64)) == -EIO)
+		printk(KERN_INFO "The mask was applied unsuccessfully");
 #endif
 	pr_debug("priv %p\n", priv);
 
-- 
2.30.2