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video: uvesafb: Fix integer overflow in allocation

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commit 9f645bcc56 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: 8bdb3a2d7d ("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>
This commit is contained in:
Kees Cook 2018-05-11 18:24:12 +10:00 committed by Greg Kroah-Hartman
parent ba195a931a
commit 842803e4a6
1 changed files with 2 additions and 1 deletions
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3
drivers/video/fbdev/uvesafb.c
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@ -1059,7 +1059,8 @@ 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;