lkml.org 
[lkml]   [2021]   [Nov]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] RDMA/mlx5: Use memset_after() to zero struct mlx5_ib_mr
Date
In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.

Use memset_after() to zero the end of struct mlx5_ib_mr that should
be initialized.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/infiniband/hw/mlx5/mlx5_ib.h | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index e636e954f6bf..af94c9fe8753 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -665,8 +665,7 @@ struct mlx5_ib_mr {
/* User MR data */
struct mlx5_cache_ent *cache_ent;
struct ib_umem *umem;
-
- /* This is zero'd when the MR is allocated */
+ /* Everything after umem is zero'd when the MR is allocated */
union {
/* Used only while the MR is in the cache */
struct {
@@ -718,7 +717,7 @@ struct mlx5_ib_mr {
/* Zero the fields in the mr that are variant depending on usage */
static inline void mlx5_clear_mr(struct mlx5_ib_mr *mr)
{
- memset(mr->out, 0, sizeof(*mr) - offsetof(struct mlx5_ib_mr, out));
+ memset_after(mr, 0, umem);
}

static inline bool is_odp_mr(struct mlx5_ib_mr *mr)
--
2.30.2
\
 
 \ /
  Last update: 2021-11-18 21:31    [W:0.106 / U:0.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site