linux-kernel - drivers/net/ieee802154/ca8210.c:918:9-12: ERROR: spi is NULL but dereferenced. (fwd)

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Message-ID: <alpine.DEB.2.20.1705240937050.2983@hadrien>
Date:   Wed, 24 May 2017 09:38:14 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Harry Morris <harrymorris12@...il.com>
cc:     Marcel Holtmann <marcel@...tmann.org>,
        linux-kernel@...r.kernel.org, kbuild-all@...org
Subject: drivers/net/ieee802154/ca8210.c:918:9-12: ERROR: spi is NULL but
 dereferenced. (fwd)

dev_crit should dereference its first argument, so &spi->dev is not valid
in this place if spi is NULL.

julia

---------- Forwarded message ----------
Date: Wed, 24 May 2017 05:55:09 +0800
From: kbuild test robot <fengguang.wu@...el.com>
To: kbuild@...org
Cc: Julia Lawall <julia.lawall@...6.fr>
Subject: drivers/net/ieee802154/ca8210.c:918:9-12: ERROR: spi is NULL but
    dereferenced.

CC: kbuild-all@...org
CC: linux-kernel@...r.kernel.org
TO: Harry Morris <harrymorris12@...il.com>
CC: Marcel Holtmann <marcel@...tmann.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   56fff1bb0f31358bf81a3c64a8dcd6da0dc44263
commit: ded845a781a578dfb0b5b2c138e5a067aa3b1242 ieee802154: Add CA8210 IEEE 802.15.4 device driver
date:   6 weeks ago
:::::: branch date: 5 hours ago
:::::: commit date: 6 weeks ago

>> drivers/net/ieee802154/ca8210.c:918:9-12: ERROR: spi is NULL but dereferenced.

git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git remote update linus
git checkout ded845a781a578dfb0b5b2c138e5a067aa3b1242
vim +918 drivers/net/ieee802154/ca8210.c

ded845a78 Harry Morris 2017-03-28  902   * @len: length of the buffer being sent
ded845a78 Harry Morris 2017-03-28  903   *
ded845a78 Harry Morris 2017-03-28  904   * Return: 0 or linux error code
ded845a78 Harry Morris 2017-03-28  905   */
ded845a78 Harry Morris 2017-03-28  906  static int ca8210_spi_transfer(
ded845a78 Harry Morris 2017-03-28  907  	struct spi_device  *spi,
ded845a78 Harry Morris 2017-03-28  908  	const u8           *buf,
ded845a78 Harry Morris 2017-03-28  909  	size_t              len
ded845a78 Harry Morris 2017-03-28  910  )
ded845a78 Harry Morris 2017-03-28  911  {
ded845a78 Harry Morris 2017-03-28  912  	int i, status = 0;
ded845a78 Harry Morris 2017-03-28  913  	struct ca8210_priv *priv = spi_get_drvdata(spi);
ded845a78 Harry Morris 2017-03-28  914  	struct cas_control *cas_ctl;
ded845a78 Harry Morris 2017-03-28  915
ded845a78 Harry Morris 2017-03-28  916  	if (!spi) {
ded845a78 Harry Morris 2017-03-28  917  		dev_crit(
ded845a78 Harry Morris 2017-03-28 @918  			&spi->dev,
ded845a78 Harry Morris 2017-03-28  919  			"NULL spi device passed to ca8210_spi_transfer\n"
ded845a78 Harry Morris 2017-03-28  920  		);
ded845a78 Harry Morris 2017-03-28  921  		return -ENODEV;
ded845a78 Harry Morris 2017-03-28  922  	}
ded845a78 Harry Morris 2017-03-28  923
ded845a78 Harry Morris 2017-03-28  924  	reinit_completion(&priv->spi_transfer_complete);
ded845a78 Harry Morris 2017-03-28  925
ded845a78 Harry Morris 2017-03-28  926  	dev_dbg(&spi->dev, "ca8210_spi_transfer called\n");

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