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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2019-05-07 11:36:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-24 20:40:10 +0200 |
| commit | 110080cea0d0e4dfdb0b536e7f8a5633ead6a781 (patch) | |
| tree | 175c7135a67aeec7d97deae544bb373b8887ad04 /drivers/fpga/zynqmp-fpga.c | |
| parent | 1c7ebeabc9e5ee12e42075a597de40fdb9059530 (diff) | |
| download | linux-110080cea0d0e4dfdb0b536e7f8a5633ead6a781.tar.bz2 | |
genwqe: Prevent an integer overflow in the ioctl
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@oracle.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga/zynqmp-fpga.c')
0 files changed, 0 insertions, 0 deletions