diff mbox series

[<PATCH,v1>,3/4] mmc: core: Make host->card as NULL when card is removed

Message ID 3addbea5a12e783a802d57a901785e5c9f7f858d.1582839544.git.nguyenb@codeaurora.org
State New
Headers show
Series SD card bug fixes | expand

Commit Message

Bao D. Nguyen Feb. 27, 2020, 10:05 p.m. UTC
From: Ritesh Harjani <riteshh@codeaurora.org>

Make host->card as NULL when card is removed otherwise
we do see some kernel crashes in async contexts,
where host->card is referred (as dangling pointer).

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
 drivers/mmc/core/bus.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 4558f51..4677603 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -252,12 +252,15 @@  void mmc_unregister_driver(struct mmc_driver *drv)
 static void mmc_release_card(struct device *dev)
 {
 	struct mmc_card *card = mmc_dev_to_card(dev);
+	struct mmc_host *host = card->host;
 
 	sdio_free_common_cis(card);
 
 	kfree(card->info);
 
 	kfree(card);
+	if (host)
+		host->card = NULL;
 }
 
 /*