From: Kees Cook Date: Fri, 11 May 2018 08:24:12 +0000 (+1000) Subject: video: uvesafb: Fix integer overflow in allocation X-Git-Tag: v4.18-rc1~35^2~16 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=9f645bcc566a1e9f921bdae7528a01ced5bc3713;p=users%2Fjedix%2Flinux-maple.git video: uvesafb: Fix integer overflow in allocation cmap->len can get close to INT_MAX/2, allowing for an integer overflow in allocation. This uses kmalloc_array() instead to catch the condition. Reported-by: Dr Silvio Cesare of InfoSect Fixes: 8bdb3a2d7df48 ("uvesafb: the driver core") Cc: stable@vger.kernel.org Signed-off-by: Kees Cook --- diff --git a/drivers/video/fbdev/uvesafb.c b/drivers/video/fbdev/uvesafb.c index 73676eb0244a..c592ca513115 100644 --- a/drivers/video/fbdev/uvesafb.c +++ b/drivers/video/fbdev/uvesafb.c @@ -1044,7 +1044,8 @@ static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info) info->cmap.len || cmap->start < info->cmap.start) return -EINVAL; - entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL); + entries = kmalloc_array(cmap->len, sizeof(*entries), + GFP_KERNEL); if (!entries) return -ENOMEM;