This is a note to let you know that I've just added the patch titled
mmc: sdio: fix possible resource leaks in some error paths
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-sdio-fix-possible-resource-leaks-in-some-error-paths.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 605d9fb9556f8f5fb4566f4df1480f280f308ded Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Date: Mon, 30 Jan 2023 20:58:08 +0800
Subject: mmc: sdio: fix possible resource leaks in some error paths
From: Yang Yingliang <yangyingliang@xxxxxxxxxx>
commit 605d9fb9556f8f5fb4566f4df1480f280f308ded upstream.
If sdio_add_func() or sdio_init_func() fails, sdio_remove_func() can
not release the resources, because the sdio function is not presented
in these two cases, it won't call of_node_put() or put_device().
To fix these leaks, make sdio_func_present() only control whether
device_del() needs to be called or not, then always call of_node_put()
and put_device().
In error case in sdio_init_func(), the reference of 'card->dev' is
not get, to avoid redundant put in sdio_free_func_cis(), move the
get_device() to sdio_alloc_func() and put_device() to sdio_release_func(),
it can keep the get/put function be balanced.
Without this patch, while doing fault inject test, it can get the
following leak reports, after this fix, the leak is gone.
unreferenced object 0xffff888112514000 (size 2048):
comm "kworker/3:2", pid 65, jiffies 4294741614 (age 124.774s)
hex dump (first 32 bytes):
00 e0 6f 12 81 88 ff ff 60 58 8d 06 81 88 ff ff ..o.....`X......
10 40 51 12 81 88 ff ff 10 40 51 12 81 88 ff ff .@Q......@Q.....
backtrace:
[<000000009e5931da>] kmalloc_trace+0x21/0x110
[<000000002f839ccb>] mmc_alloc_card+0x38/0xb0 [mmc_core]
[<0000000004adcbf6>] mmc_sdio_init_card+0xde/0x170 [mmc_core]
[<000000007538fea0>] mmc_attach_sdio+0xcb/0x1b0 [mmc_core]
[<00000000d4fdeba7>] mmc_rescan+0x54a/0x640 [mmc_core]
unreferenced object 0xffff888112511000 (size 2048):
comm "kworker/3:2", pid 65, jiffies 4294741623 (age 124.766s)
hex dump (first 32 bytes):
00 40 51 12 81 88 ff ff e0 58 8d 06 81 88 ff ff .@Q......X......
10 10 51 12 81 88 ff ff 10 10 51 12 81 88 ff ff ..Q.......Q.....
backtrace:
[<000000009e5931da>] kmalloc_trace+0x21/0x110
[<00000000fcbe706c>] sdio_alloc_func+0x35/0x100 [mmc_core]
[<00000000c68f4b50>] mmc_attach_sdio.cold.18+0xb1/0x395 [mmc_core]
[<00000000d4fdeba7>] mmc_rescan+0x54a/0x640 [mmc_core]
Fixes: 3d10a1ba0d37 ("sdio: fix reference counting in sdio_remove_func()")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230130125808.3471254-1-yangyingliang@xxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/sdio_bus.c | 17 ++++++++++++++---
drivers/mmc/core/sdio_cis.c | 12 ------------
2 files changed, 14 insertions(+), 15 deletions(-)
--- a/drivers/mmc/core/sdio_bus.c
+++ b/drivers/mmc/core/sdio_bus.c
@@ -293,6 +293,12 @@ static void sdio_release_func(struct dev
if (!(func->card->quirks & MMC_QUIRK_NONSTD_SDIO))
sdio_free_func_cis(func);
+ /*
+ * We have now removed the link to the tuples in the
+ * card structure, so remove the reference.
+ */
+ put_device(&func->card->dev);
+
kfree(func->info);
kfree(func->tmpbuf);
kfree(func);
@@ -323,6 +329,12 @@ struct sdio_func *sdio_alloc_func(struct
device_initialize(&func->dev);
+ /*
+ * We may link to tuples in the card structure,
+ * we need make sure we have a reference to it.
+ */
+ get_device(&func->card->dev);
+
func->dev.parent = &card->dev;
func->dev.bus = &sdio_bus_type;
func->dev.release = sdio_release_func;
@@ -376,10 +388,9 @@ int sdio_add_func(struct sdio_func *func
*/
void sdio_remove_func(struct sdio_func *func)
{
- if (!sdio_func_present(func))
- return;
+ if (sdio_func_present(func))
+ device_del(&func->dev);
- device_del(&func->dev);
of_node_put(func->dev.of_node);
put_device(&func->dev);
}
--- a/drivers/mmc/core/sdio_cis.c
+++ b/drivers/mmc/core/sdio_cis.c
@@ -404,12 +404,6 @@ int sdio_read_func_cis(struct sdio_func
return ret;
/*
- * Since we've linked to tuples in the card structure,
- * we must make sure we have a reference to it.
- */
- get_device(&func->card->dev);
-
- /*
* Vendor/device id is optional for function CIS, so
* copy it from the card structure as needed.
*/
@@ -434,11 +428,5 @@ void sdio_free_func_cis(struct sdio_func
}
func->tuples = NULL;
-
- /*
- * We have now removed the link to the tuples in the
- * card structure, so remove the reference.
- */
- put_device(&func->card->dev);
}
Patches currently in stable-queue which might be from yangyingliang@xxxxxxxxxx are
queue-5.15/mmc-mmc_spi-fix-error-handling-in-mmc_spi_probe.patch
queue-5.15/mmc-sdio-fix-possible-resource-leaks-in-some-error-paths.patch
