On 5/25/20 10:03 AM, Björn Töpel wrote:
From: Björn Töpel <bjorn.to...@intel.com>
The npgs member of struct xdp_umem is an u32 entity, and stores the
number of pages the UMEM consumes. The calculation of npgs
npgs = size / PAGE_SIZE
can overflow.
To avoid overflow scenarios, the division is now first stored in a
u64, and the result is verified to fit into 32b.
An alternative would be storing the npgs as a u64, however, this
wastes memory and is an unrealisticly large packet area.
Link:
https://lore.kernel.org/bpf/CACtPs=ggvv-_yj6rbpztvnopgi5nhmocctkskyrjhgqhjwf...@mail.gmail.com/
Fixes: c0c77d8fb787 ("xsk: add user memory registration support sockopt")
Reported-by: "Minh Bùi Quang" <minhquangbu...@gmail.com>
Signed-off-by: Björn Töpel <bjorn.to...@intel.com>
Applied, thanks!
