linux-kernel - [PATCH][next][V2] RDMA/bnxt_re: Fix uninitialized struct bit field rsvd1

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Date:   Wed, 23 Jun 2021 19:24:37 +0100
From:   Colin King <colin.king@...onical.com>
To:     Selvin Xavier <selvin.xavier@...adcom.com>,
        Devesh Sharma <devesh.sharma@...adcom.com>,
        Naresh Kumar PBS <nareshkumar.pbs@...adcom.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next][V2] RDMA/bnxt_re: Fix uninitialized struct bit field rsvd1

From: Colin Ian King <colin.king@...onical.com>

The bit field rsvd1 in resp is not being initialized and garbage data
is being copied from the stack back to userspace via the ib_copy_to_udata
call. Fix this by setting the entire struct resp to zero; this will ensure
that further new bit fields in the future will be zero'd too.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 879740517dab ("RDMA/bnxt_re: Update ABI to pass wqe-mode to user space")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---

V2: set entire struct resp to zero rather than the new field. Thanks to
    Jason Gunthorpe for suggesting this improved fix.

---
 drivers/infiniband/hw/bnxt_re/ib_verbs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index 5955713234cb..6d4508794342 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -3844,7 +3844,7 @@ int bnxt_re_alloc_ucontext(struct ib_ucontext *ctx, struct ib_udata *udata)
 		container_of(ctx, struct bnxt_re_ucontext, ib_uctx);
 	struct bnxt_re_dev *rdev = to_bnxt_re_dev(ibdev, ibdev);
 	struct bnxt_qplib_dev_attr *dev_attr = &rdev->dev_attr;
-	struct bnxt_re_uctx_resp resp;
+	struct bnxt_re_uctx_resp resp = {};
 	u32 chip_met_rev_num = 0;
 	int rc;
 
-- 
2.31.1