Makes ib_uverbs_poll_cq() check the length of the output buffer: this will prevent the function from writing past userspace provided buffer.
Signed-off-by: Yann Droneaud <[email protected]> Link: http://mid.gmane.org/[email protected] --- drivers/infiniband/core/uverbs_cmd.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index dc0574f..5981604 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -1436,6 +1436,9 @@ ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file, if (copy_from_user(&cmd, buf, sizeof cmd)) return -EFAULT; + if ((out_len - sizeof resp)/(sizeof(struct ib_uverbs_wc)) < cmd.ne) + return -ENOSPC; + cq = idr_read_cq(cmd.cq_handle, file->ucontext, 0); if (!cq) return -EINVAL; -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
