linux-kernel - [PATCH] NFC: st21nfcb: drop kfree of devm

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Message-ID: <20140810200107.GA4170@himangi-Dell>
Date:	Mon, 11 Aug 2014 01:31:08 +0530
From:	Himangi Saraogi <himangi774@...il.com>
To:	Lauro Ramos Venancio <lauro.venancio@...nbossa.org>,
	Aloisio Almeida Jr <aloisio.almeida@...nbossa.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-wireless@...r.kernel.org, linux-nfc@...ts.01.org,
	linux-kernel@...r.kernel.org
Cc:	Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH] NFC: st21nfcb: drop kfree of devm_kzalloc's data

Using kfree to free data allocated with devm_kzalloc causes double frees.

The Coccinelle semantic patch that fixes this problem is as follows:

// <smpl>
@@
expression x;
@@

x = devm_kzalloc(...)
...
?-kfree(x);
// </smpl>

Signed-off-by: Himangi Saraogi <himangi774@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
---
 drivers/nfc/st21nfcb/st21nfcb.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/nfc/st21nfcb/st21nfcb.c b/drivers/nfc/st21nfcb/st21nfcb.c
index 4d95863..b0c4a0f9 100644
--- a/drivers/nfc/st21nfcb/st21nfcb.c
+++ b/drivers/nfc/st21nfcb/st21nfcb.c
@@ -94,8 +94,7 @@ int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
 					phy_headroom, phy_tailroom);
 	if (!ndlc->ndev) {
 		pr_err("Cannot allocate nfc ndev\n");
-		r = -ENOMEM;
-		goto err_alloc_ndev;
+		return -ENOMEM;
 	}
 	info->ndlc = ndlc;
 
@@ -109,19 +108,14 @@ int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
 err_regdev:
 	nci_free_device(ndlc->ndev);
 
-err_alloc_ndev:
-	kfree(info);
 	return r;
 }
 EXPORT_SYMBOL_GPL(st21nfcb_nci_probe);
 
 void st21nfcb_nci_remove(struct nci_dev *ndev)
 {
-	struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
-
 	nci_unregister_device(ndev);
 	nci_free_device(ndev);
-	kfree(info);
 }
 EXPORT_SYMBOL_GPL(st21nfcb_nci_remove);
 
-- 
1.9.1

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