From 34855706c30d52b0a744da44348b5d1cc39fbe51 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 16 Feb 2016 14:25:00 +0100 Subject: [PATCH] drm/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@vger.kernel.org Cc: gnomes@lxorguk.ukuu.org.uk Signed-off-by: Gerd Hoffmann Reviewed-by: Daniel Vetter Signed-off-by: Dave Airlie --- 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 2ae8577497ca..7c2e78201ead 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; -- 2.20.1