From: Dan Carpenter Date: Fri, 23 Sep 2011 06:14:35 +0000 (+0300) Subject: NFC: use after free on error X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8ebafde00ed0c682fed8c34ac5ba90160ea0bb30;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git NFC: use after free on error We returned a freed variable on some error paths when the intent was to return a NULL. Part of the reason this was missed was that the code was confusing because it had too many gotos so I removed them and simplified the flow a bit. Signed-off-by: Dan Carpenter Acked-by: Lauro Ramos Venancio Signed-off-by: John W. Linville --- diff --git a/net/nfc/nci/core.c b/net/nfc/nci/core.c index 1e6b20f2bc99..4047e29acb3b 100644 --- a/net/nfc/nci/core.c +++ b/net/nfc/nci/core.c @@ -499,19 +499,19 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops, int tx_headroom, int tx_tailroom) { - struct nci_dev *ndev = NULL; + struct nci_dev *ndev; nfc_dbg("entry, supported_protocols 0x%x", supported_protocols); if (!ops->open || !ops->close || !ops->send) - goto exit; + return NULL; if (!supported_protocols) - goto exit; + return NULL; ndev = kzalloc(sizeof(struct nci_dev), GFP_KERNEL); if (!ndev) - goto exit; + return NULL; ndev->ops = ops; ndev->tx_headroom = tx_headroom; @@ -526,13 +526,11 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops, nfc_set_drvdata(ndev->nfc_dev, ndev); - goto exit; + return ndev; free_exit: kfree(ndev); - -exit: - return ndev; + return NULL; } EXPORT_SYMBOL(nci_allocate_device);