diff mbox series

[v3,1/3] mmc: sdio: fix possible memory leak in sdio_init_func()

Message ID 20221109025142.1565445-2-yangyingliang@huawei.com
State New
Headers show
Series mmc: sdio: fixes some leaks | expand

Commit Message

Yang Yingliang Nov. 9, 2022, 2:51 a.m. UTC
If it fails in sdio_init_func(), sdio_remove_func() can not
free the memory that allocated in sdio_alloc_func(), because
sdio_add_func() is not called yet, the sdio function is not
presented and sdio_remove_func() will return directly.

In this error path, we can not call put_device(), because
sdio_free_func_cis() is called in sdio_release_func(), if
sdio_read_func_cis() fails, it will cause to put a reference
that has not been got.

So fix these leaks with calling kfree() instead of sdio_remove_func()
in error path.

Fixes: 3d10a1ba0d37 ("sdio: fix reference counting in sdio_remove_func()")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/mmc/core/sdio.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index f64b9ac76a5c..d1c6f18874aa 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -133,11 +133,8 @@  static int sdio_init_func(struct mmc_card *card, unsigned int fn)
 	return 0;
 
 fail:
-	/*
-	 * It is okay to remove the function here even though we hold
-	 * the host lock as we haven't registered the device yet.
-	 */
-	sdio_remove_func(func);
+	kfree(func->tmpbuf);
+	kfree(func);
 	return ret;
 }