linux-kernel - [PATCH][next] RDMA/bnxt_re: fix or'ing of data into an uninitialized struct member

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Message-Id: <20190211133415.9020-1-colin.king@canonical.com>
Date:   Mon, 11 Feb 2019 13:34:15 +0000
From:   Colin King <colin.king@...onical.com>
To:     Selvin Xavier <selvin.xavier@...adcom.com>,
        Devesh Sharma <devesh.sharma@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] RDMA/bnxt_re: fix or'ing of data into an uninitialized struct member

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

The struct member comp_mask has not been initialized however a bit
pattern is being bitwise or'd into the member and hence other bit
fields in comp_mask may contain any garbage from the stack. Fix this
by making the bitwise or into an assignment.

Fixes: 95b86d1c91ad ("RDMA/bnxt_re: Update kernel user abi to pass chip context")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 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 1d7469e23cde..de5cb9a61a78 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -3720,7 +3720,7 @@ struct ib_ucontext *bnxt_re_alloc_ucontext(struct ib_device *ibdev,
 	}
 	spin_lock_init(&uctx->sh_lock);
 
-	resp.comp_mask |= BNXT_RE_UCNTX_CMASK_HAVE_CCTX;
+	resp.comp_mask = BNXT_RE_UCNTX_CMASK_HAVE_CCTX;
 	chip_met_rev_num = rdev->chip_ctx.chip_num;
 	chip_met_rev_num |= ((u32)rdev->chip_ctx.chip_rev & 0xFF) <<
 			     BNXT_RE_CHIP_ID0_CHIP_REV_SFT;
-- 
2.20.1