[PATCH 5.14 186/849] pinctrl: core: fix possible memory leak in pinctrl_enable()

Greg Kroah-Hartman
2021-11-15T22:06:38Z

From: Yang Yingliang <yangyingliang@huawei.com>

commit c7892ae13e461ed20154321eb792e07ebe38f5b3 upstream.

I got memory leak as follows when doing fault injection test:

unreferenced object 0xffff888020a7a680 (size 64):
comm "i2c-mcp23018-41", pid 23090, jiffies 4295160544 (age 8.680s)
hex dump (first 32 bytes):
00 48 d3 1e 80 88 ff ff 00 1a 56 c1 ff ff ff ff .H........V.....
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<0000000083c79b35>] kmem_cache_alloc_trace+0x16d/0x360
[<0000000051803c95>] pinctrl_init_controller+0x6ed/0xb70
[<0000000064346707>] pinctrl_register+0x27/0x80
[<0000000029b0e186>] devm_pinctrl_register+0x5b/0xe0
[<00000000391f5a3e>] mcp23s08_probe_one+0x968/0x118a [pinctrl_mcp23s08]
[<000000006112c039>] mcp230xx_probe+0x266/0x560 [pinctrl_mcp23s08_i2c]

If pinctrl_claim_hogs() fails, the 'pindesc' allocated in pinctrl_register_one_pin()
need be freed.

Cc: stable@vger.kernel.org
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 950b0d91dc10 ("pinctrl: core: Fix regression caused by delayed work for hogs")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20211022014323.1156924-1-yangyingliang@huawei.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/pinctrl/core.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -2100,6 +2100,8 @@ int pinctrl_enable(struct pinctrl_dev *p
if (error) {
dev_err(pctldev->dev, "could not claim hogs: %i\n",
error);
+ pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
+ pctldev->desc->npins);
mutex_destroy(&pctldev->mutex);
kfree(pctldev);