linux-kernel - [PATCH v2] qxl: use kmalloc_array to alloc reloc_info in qxl_process_single

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Date:	Tue, 16 Feb 2016 14:25:00 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	David Airlie <airlied@...ux.ie>
Cc:	Daniel Vetter <daniel@...ll.ch>, Gerd Hoffmann <kraxel@...hat.com>,
	stable@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
	dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] qxl: use kmalloc_array to alloc reloc_info in qxl_process_single_command

This avoids integer overflows on 32bit machines when calculating
reloc_info size, as reported by Alan Cox.

Cc: stable@...r.kernel.org
Cc: gnomes@...rguk.ukuu.org.uk
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/gpu/drm/qxl/qxl_ioctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/qxl/qxl_ioctl.c b/drivers/gpu/drm/qxl/qxl_ioctl.c
index 2ae8577..7c2e782 100644
--- a/drivers/gpu/drm/qxl/qxl_ioctl.c
+++ b/drivers/gpu/drm/qxl/qxl_ioctl.c
@@ -168,7 +168,8 @@ static int qxl_process_single_command(struct qxl_device *qdev,
 		       cmd->command_size))
 		return -EFAULT;
 
-	reloc_info = kmalloc(sizeof(struct qxl_reloc_info) * cmd->relocs_num, GFP_KERNEL);
+	reloc_info = kmalloc_array(cmd->relocs_num,
+				   sizeof(struct qxl_reloc_info), GFP_KERNEL);
 	if (!reloc_info)
 		return -ENOMEM;
 
-- 
1.8.3.1