From: Yann Droneaud Date: Mon, 10 Mar 2014 22:06:25 +0000 (+0100) Subject: IB/ehca: Returns an error on ib_copy_to_udata() failure X-Git-Tag: v3.4.89~20 X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=794f9950ebd832b8712e32007e0359e5c6e60f55;p=linux IB/ehca: Returns an error on ib_copy_to_udata() failure commit 5bdb0f02add5994b0bc17494f4726925ca5d6ba1 upstream. In case of error when writing to userspace, function ehca_create_cq() does not set an error code before following its error path. This patch sets the error code to -EFAULT when ib_copy_to_udata() fails. This was caught when using spatch (aka. coccinelle) to rewrite call to ib_copy_{from,to}_udata(). Link: https://www.gitorious.org/opteya/coccib/source/75ebf2c1033c64c1d81df13e4ae44ee99c989eba:ib_copy_udata.cocci Link: http://marc.info/?i=cover.1394485254.git.ydroneaud@opteya.com Signed-off-by: Yann Droneaud Signed-off-by: Roland Dreier Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/infiniband/hw/ehca/ehca_cq.c b/drivers/infiniband/hw/ehca/ehca_cq.c index d9b0ebcb67d7..6eeb84d6e5cf 100644 --- a/drivers/infiniband/hw/ehca/ehca_cq.c +++ b/drivers/infiniband/hw/ehca/ehca_cq.c @@ -296,6 +296,7 @@ struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe, int comp_vector, (my_cq->galpas.user.fw_handle & (PAGE_SIZE - 1)); if (ib_copy_to_udata(udata, &resp, sizeof(resp))) { ehca_err(device, "Copy to udata failed."); + cq = ERR_PTR(-EFAULT); goto create_cq_exit4; } }