linux-kernel - [PATCH 5.6 154/161] mmc: sdio: Fix potential NULL pointer error in mmc_sdio_init

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Message-Id: <20200616153113.682730368@linuxfoundation.org>
Date:   Tue, 16 Jun 2020 17:35:44 +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, Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.6 154/161] mmc: sdio: Fix potential NULL pointer error in mmc_sdio_init_card()

From: Ulf Hansson <ulf.hansson@...aro.org>

commit f04086c225da11ad16d7f9a2fbca6483ab16dded upstream.

During some scenarios mmc_sdio_init_card() runs a retry path for the UHS-I
specific initialization, which leads to removal of the previously allocated
card. A new card is then re-allocated while retrying.

However, in one of the corresponding error paths we may end up to remove an
already removed card, which likely leads to a NULL pointer exception. So,
let's fix this.

Fixes: 5fc3d80ef496 ("mmc: sdio: don't use rocr to check if the card could support UHS mode")
Cc: <stable@...r.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Link: https://lore.kernel.org/r/20200430091640.455-2-ulf.hansson@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/core/sdio.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -718,9 +718,8 @@ try_again:
 			/* Retry init sequence, but without R4_18V_PRESENT. */
 			retries = 0;
 			goto try_again;
-		} else {
-			goto remove;
 		}
+		return err;
 	}
 
 	/*