linux-kernel - [PATCH] Bluetooth: fix kzalloc-simple.cocci warnings

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Date:   Thu, 8 Sep 2016 12:22:21 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Michał Narajowski <michal.narajowski@...ecoup.pl>
Cc:     kbuild-all@...org, Marcel Holtmann <marcel@...tmann.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] Bluetooth: fix kzalloc-simple.cocci warnings

net/bluetooth/mgmt.c:905:6-13: WARNING: kzalloc should be used for rp, instead of kmalloc/memset


 Use kzalloc rather than kmalloc followed by memset with 0

 This considers some simple cases that are common and easy to validate
 Note in particular that there are no ...s in the rule, so all of the
 matched code has to be contiguous

Generated by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci

CC: Michał Narajowski <michal.narajowski@...ecoup.pl>
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---

 mgmt.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -902,12 +902,10 @@ static int read_ext_controller_info(stru
 	eir_len = eir_append_data(buff, eir_len, EIR_NAME_SHORT,
 				  hdev->short_name, name_len);
 
-	rp = kmalloc(sizeof(*rp) + eir_len, GFP_KERNEL);
+	rp = kzalloc(sizeof(*rp) + eir_len, GFP_KERNEL);
 	if (!rp)
 		return -ENOMEM;
 
-	memset(rp, 0, sizeof(*rp) + eir_len);
-
 	rp->eir_len = cpu_to_le16(eir_len);
 	memcpy(rp->eir, buff, eir_len);