From: Hyunwoo Kim Date: Mon, 20 Jun 2022 14:17:46 +0000 (-0700) Subject: video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write X-Git-Tag: v6.1-rc5~988^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7;p=platform%2Fkernel%2Flinux-starfive.git video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write In pxa3xx_gcu_write, a count parameter of type size_t is passed to words of type int. Then, copy_from_user() may cause a heap overflow because it is used as the third argument of copy_from_user(). Signed-off-by: Hyunwoo Kim Signed-off-by: Helge Deller --- diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c index 043cc8f..c3cd1e1 100644 --- a/drivers/video/fbdev/pxa3xx-gcu.c +++ b/drivers/video/fbdev/pxa3xx-gcu.c @@ -381,7 +381,7 @@ pxa3xx_gcu_write(struct file *file, const char *buff, struct pxa3xx_gcu_batch *buffer; struct pxa3xx_gcu_priv *priv = to_pxa3xx_gcu_priv(file); - int words = count / 4; + size_t words = count / 4; /* Does not need to be atomic. There's a lock in user space, * but anyhow, this is just for statistics. */