linux-kernel - [PATCH 4.4 141/312] mmc: block: return error on failed mmc_blk

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Date:   Fri,  8 May 2020 14:32:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Olof Johansson <olof@...om.net>,
        Grant Grundler <grundler@...gle.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 4.4 141/312] mmc: block: return error on failed mmc_blk_get()

From: Olof Johansson <olof@...om.net>

commit f00ab14c252ac459e86194747a1f580ab503c954 upstream.

This used to return -EFAULT, but the function above returns -EINVAL on
the same condition so let's stick to that.

The removal of error return on this path was introduced with b093410c9aef
('mmc: block: copy resp[] data on err for MMC_IOC_MULTI_CMD').

Fixes: b093410c9aef ('mmc: block: copy resp[] data on err for MMC_IOC_MULTI_CMD').
Signed-off-by: Olof Johansson <olof@...om.net>
Cc: Grant Grundler <grundler@...gle.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/card/block.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -668,8 +668,10 @@ static int mmc_blk_ioctl_multi_cmd(struc
 	}

 	md = mmc_blk_get(bdev->bd_disk);
-	if (!md)
+	if (!md) {
+		err = -EINVAL;
 		goto cmd_err;
+	}

 	card = md->queue.card;
 	if (IS_ERR(card)) {