3.16.75-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 110080cea0d0e4dfdb0b536e7f8a5633ead6a781 upstream.
There are a couple potential integer overflows here.
round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
The first thing is that the "m->size + (...)" addition could overflow,
and the second is that round_up() overflows to zero if the result is
within PAGE_SIZE of the type max.
In this code, the "m->size" variable is an u64 but we're saving the
result in "map_size" which is an unsigned long and genwqe_user_vmap()
takes an unsigned long as well. So I have used ULONG_MAX as the upper
bound. From a practical perspective unsigned long is fine/better than
trying to change all the types to u64.
Fixes: eaf4722d4645 ("GenWQE Character device and DDCB queue")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/misc/genwqe/card_dev.c | 2 ++
drivers/misc/genwqe/card_utils.c | 4 ++++
2 files changed, 6 insertions(+)
--- a/drivers/misc/genwqe/card_dev.c
+++ b/drivers/misc/genwqe/card_dev.c
@@ -779,6 +779,8 @@ static int genwqe_pin_mem(struct genwqe_
if ((m->addr == 0x0) || (m->size == 0))
return -EINVAL;
+ if (m->size > ULONG_MAX - PAGE_SIZE - (m->addr & ~PAGE_MASK))
+ return -EINVAL;
map_addr = (m->addr & PAGE_MASK);
map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
--- a/drivers/misc/genwqe/card_utils.c
+++ b/drivers/misc/genwqe/card_utils.c
@@ -571,6 +571,10 @@ int genwqe_user_vmap(struct genwqe_dev *
/* determine space needed for page_list. */
data = (unsigned long)uaddr;
offs = offset_in_page(data);
+ if (size > ULONG_MAX - PAGE_SIZE - offs) {
+ m->size = 0; /* mark unused and not added */
+ return -EINVAL;
+ }
m->nr_pages = DIV_ROUND_UP(offs + size, PAGE_SIZE);
m->page_list = kcalloc(m->nr_pages,
