4.17-stable review patch. If anyone has any objections, please let me know.
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From: Kees Cook keescook@chromium.org
commit 9f645bcc566a1e9f921bdae7528a01ced5bc3713 upstream.
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 silvio.cesare@gmail.com Fixes: 8bdb3a2d7df48 ("uvesafb: the driver core") Cc: stable@vger.kernel.org Signed-off-by: Kees Cook keescook@chromium.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/video/fbdev/uvesafb.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/video/fbdev/uvesafb.c +++ b/drivers/video/fbdev/uvesafb.c @@ -1044,7 +1044,8 @@ static int uvesafb_setcmap(struct fb_cma 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;