[PATCH 5.1 053/121] IB/hfi1: Validate page aligned for a given virtual address

From: Greg Kroah-Hartman
Date: Mon Jun 24 2019 - 06:09:03 EST

[ Upstream commit 97736f36dbebf2cda2799db3b54717ba5b388255 ]

User applications can register memory regions for TID buffers that are not
aligned on page boundaries. Hfi1 is expected to pin those pages in memory
and cache the pages with mmu_rb. The rb tree will fail to insert pages
that are not aligned correctly.

Validate whether a given virtual address is page aligned before pinning.

Fixes: 7e7a436ecb6e ("staging/hfi1: Add TID entry program function body")
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
Signed-off-by: Kamenee Arumugam <kamenee.arumugam@xxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/infiniband/hw/hfi1/user_exp_rcv.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/hw/hfi1/user_exp_rcv.c b/drivers/infiniband/hw/hfi1/user_exp_rcv.c
index 0cd71ce7cc71..3592a9ec155e 100644
--- a/drivers/infiniband/hw/hfi1/user_exp_rcv.c
+++ b/drivers/infiniband/hw/hfi1/user_exp_rcv.c
@@ -324,6 +324,9 @@ int hfi1_user_exp_rcv_setup(struct hfi1_filedata *fd,
u32 *tidlist = NULL;
struct tid_user_buf *tidbuf;

+ if (!PAGE_ALIGNED(tinfo->vaddr))
+ return -EINVAL;
tidbuf = kzalloc(sizeof(*tidbuf), GFP_KERNEL);
if (!tidbuf)
return -ENOMEM;