linux-kernel - [PATCH] mmc: sdio: fix kernel panic when remove non-standard SDIO card

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Message-ID: <20220927020158.1218469-1-ouyangweizhao@zeku.com>
Date:   Tue, 27 Sep 2022 10:01:58 +0800
From:   Weizhao Ouyang <ouyangweizhao@...u.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        John Wang <wangdayu@...u.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Matthew Ma <mahongwei@...u.com>,
        "Weizhao Ouyang" <ouyangweizhao@...u.com>,
        Pierre Ossman <drzeus@...eus.cx>
CC:     <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] mmc: sdio: fix kernel panic when remove non-standard SDIO card

From: Matthew Ma <mahongwei@...u.com>

SDIO tuple is only allocated for standard SDIO card, especially it
causes memory corruption issues when the non-standard SDIO card has
removed since the card device's reference counter does not increase for
it at sdio_init_func(), but all SDIO card device reference counter has
decreased at sdio_release_func().

Fixes: 1a632f8cdc33 ("sdio: split up common and function CIS parsing")
Signed-off-by: Matthew Ma <mahongwei@...u.com>
Reviewed-by: Weizhao Ouyang <ouyangweizhao@...u.com>
Reviewed-by: John Wang <wangdayu@...u.com>
---
 drivers/mmc/core/sdio_bus.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c
index c6268c38c69e..babf21a0adeb 100644
--- a/drivers/mmc/core/sdio_bus.c
+++ b/drivers/mmc/core/sdio_bus.c
@@ -291,7 +291,8 @@ static void sdio_release_func(struct device *dev)
 {
	struct sdio_func *func = dev_to_sdio_func(dev);
 
-	sdio_free_func_cis(func);
+	if (!(func->card->quirks & MMC_QUIRK_NONSTD_SDIO))
+		sdio_free_func_cis(func);
 
	kfree(func->info);
	kfree(func->tmpbuf);
-- 
2.25.1