linux-kernel - [PATCH AUTOSEL 6.7 05/23] dpll: fix broken error path in dpll_pin

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Date: Fri,  2 Feb 2024 13:39:01 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
	Jiri Pirko <jiri@...dia.com>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>,
	vadim.fedorenko@...ux.dev,
	jiri@...nulli.us,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.7 05/23] dpll: fix broken error path in dpll_pin_alloc(..)

From: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>

[ Upstream commit b6a11a7fc4d6337f7ea720b9287d1b9749c4eae0 ]

If pin type is not expected, or pin properities failed to allocate
memory, the unwind error path shall not destroy pin's xarrays, which
were not yet initialized.
Add new goto label and use it to fix broken error path.

Reviewed-by: Jiri Pirko <jiri@...dia.com>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dpll/dpll_core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c
index 3568149b9562..36f5c0eaf604 100644
--- a/drivers/dpll/dpll_core.c
+++ b/drivers/dpll/dpll_core.c
@@ -440,7 +440,7 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module,
 	if (WARN_ON(prop->type < DPLL_PIN_TYPE_MUX ||
 		    prop->type > DPLL_PIN_TYPE_MAX)) {
 		ret = -EINVAL;
-		goto err;
+		goto err_pin_prop;
 	}
 	pin->prop = prop;
 	refcount_set(&pin->refcount, 1);
@@ -448,11 +448,12 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module,
 	xa_init_flags(&pin->parent_refs, XA_FLAGS_ALLOC);
 	ret = xa_alloc(&dpll_pin_xa, &pin->id, pin, xa_limit_16b, GFP_KERNEL);
 	if (ret)
-		goto err;
+		goto err_xa_alloc;
 	return pin;
-err:
+err_xa_alloc:
 	xa_destroy(&pin->dpll_refs);
 	xa_destroy(&pin->parent_refs);
+err_pin_prop:
 	kfree(pin);
 	return ERR_PTR(ret);
 }
-- 
2.43.0