linux-kernel - [PATCH 3.12 19/82] spi: Fix crash with double message finalisation on error handling

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Message-Id: <20140220235020.057445711@linuxfoundation.org>
Date:	Thu, 20 Feb 2014 15:52:02 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>,
	Mark Brown <broonie@...aro.org>
Subject: [PATCH 3.12 19/82] spi: Fix crash with double message finalisation on error handling

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Geert Uytterhoeven <geert+renesas@...ux-m68k.org>

commit 1f802f8249a0da536877842c43c7204064c4de8b upstream.

This reverts commit e120cc0dcf2880a4c5c0a6cb27b655600a1cfa1d.

It causes a NULL pointer dereference with drivers using the generic
spi_transfer_one_message(), which always calls
spi_finalize_current_message(), which zeroes master->cur_msg.

Drivers implementing transfer_one_message() theirselves must always call
spi_finalize_current_message(), even if the transfer failed:

 * @transfer_one_message: the subsystem calls the driver to transfer a single
 *      message while queuing transfers that arrive in the meantime. When the
 *      driver is finished with this message, it must call
 *      spi_finalize_current_message() so the subsystem can issue the next
 *      transfer

Signed-off-by: Geert Uytterhoeven <geert+renesas@...ux-m68k.org>
Signed-off-by: Mark Brown <broonie@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -600,9 +600,7 @@ static void spi_pump_messages(struct kth
 	ret = master->transfer_one_message(master, master->cur_msg);
 	if (ret) {
 		dev_err(&master->dev,
-			"failed to transfer one message from queue: %d\n", ret);
-		master->cur_msg->status = ret;
-		spi_finalize_current_message(master);
+			"failed to transfer one message from queue\n");
 		return;
 	}
 }

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