From: Greg Kroah-Hartman Date: Sun, 28 Dec 2025 13:17:03 +0000 (+0100) Subject: fbdev: smscufx: properly copy ioctl memory to kernelspace X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=120adae7b42faa641179270c067864544a50ab69;p=thirdparty%2Flinux.git fbdev: smscufx: properly copy ioctl memory to kernelspace The UFX_IOCTL_REPORT_DAMAGE ioctl does not properly copy data from userspace to kernelspace, and instead directly references the memory, which can cause problems if invalid data is passed from userspace. Fix this all up by correctly copying the memory before accessing it within the kernel. Reported-by: Tianchu Chen Cc: stable Cc: Steve Glendinning Cc: Helge Deller Signed-off-by: Greg Kroah-Hartman Signed-off-by: Helge Deller --- diff --git a/drivers/video/fbdev/smscufx.c b/drivers/video/fbdev/smscufx.c index 5f0dd01fd834..891ce7b76d63 100644 --- a/drivers/video/fbdev/smscufx.c +++ b/drivers/video/fbdev/smscufx.c @@ -932,7 +932,6 @@ static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) { struct ufx_data *dev = info->par; - struct dloarea *area = NULL; if (!atomic_read(&dev->usb_active)) return 0; @@ -947,6 +946,10 @@ static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd, /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ if (cmd == UFX_IOCTL_REPORT_DAMAGE) { + struct dloarea *area __free(kfree) = kmalloc(sizeof(*area), GFP_KERNEL); + if (!area) + return -ENOMEM; + /* If we have a damage-aware client, turn fb_defio "off" * To avoid perf imact of unnecessary page fault handling. * Done by resetting the delay for this fb_info to a very @@ -956,7 +959,8 @@ static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd, if (info->fbdefio) info->fbdefio->delay = UFX_DEFIO_WRITE_DISABLE; - area = (struct dloarea *)arg; + if (copy_from_user(area, (u8 __user *)arg, sizeof(*area))) + return -EFAULT; if (area->x < 0) area->x = 0;