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fbdev: sbuslib: integer overflow in sbusfb_ioctl_helper()

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[ Upstream commit e5017716adb8aa5c01c52386c1b7470101ffe9c5 ]

The "index + count" addition can overflow.  Both come directly from the
user.  This bug leads to an information leak.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Peter Malone <peter.malone@gmail.com>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2018-10-08 12:57:36 +02:00 committed by Greg Kroah-Hartman
parent e6bb4dca56
commit 8077c98ce4
1 changed files with 1 additions and 1 deletions
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2
drivers/video/fbdev/sbuslib.c
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@ -170,7 +170,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
get_user(ublue, &c->blue))
return -EFAULT;
if (index + count > cmap->len)
if (index > cmap->len || count > cmap->len - index)
return -EINVAL;
for (i = 0; i < count; i++) {