From: chiffathefox <chiffathefoxx@gmail.com>
To: Marek Vasut <marex@denx.de>
Cc: chiffathefox <chiffathefoxx@gmail.com>,
Kaustabh Chakraborty <kauschluss@disroot.org>,
Lukasz Majewski <lukma@denx.de>,
Minkyu Kang <mk7.kang@samsung.com>,
Sam Protsenko <semen.protsenko@linaro.org>,
Tom Rini <trini@konsulko.com>,
u-boot@lists.denx.de
Subject: [PATCH 2/2] clk: exynos: do not reparent requested clock
Date: Thu, 15 Jan 2026 05:11:14 +0200 [thread overview]
Message-ID: <20260115031114.220888-3-chiffathefoxx@gmail.com> (raw)
In-Reply-To: <20260115031114.220888-1-chiffathefoxx@gmail.com>
It would appear the original developer of this driver
reparented child clock devices to fix the issue described in
`clk: clk_resolve_parent_clk(): resolve external clocks by id`.
This hacky fix was the cause of invalid memory access when calling
clk_get_rate() on a clock retrieved via clk_get_by_index().
clk_get_by_index() returns a copy of the `struct clk` and
when passed to clk_get_rate() it may be forwarded to
clk_divider_recalc_rate(), which will cause the latter to
run container_of() on a pointer from caller's stack instead
of the pointer that was kzalloc()'d by the clk-divider driver.
Signed-off-by: chiffathefox <chiffathefoxx@gmail.com>
---
drivers/clk/exynos/clk.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/clk/exynos/clk.c b/drivers/clk/exynos/clk.c
index a2c9f4851da..aa4d4112db7 100644
--- a/drivers/clk/exynos/clk.c
+++ b/drivers/clk/exynos/clk.c
@@ -19,7 +19,6 @@ int samsung_clk_request(struct clk *clk)
if (ret)
return ret;
- clk->dev = c->dev;
return 0;
}
--
2.34.1
next prev parent reply other threads:[~2026-01-15 4:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-15 3:11 [PATCH 0/2] Improvements to the recent clock rework by marex chiffathefox
2026-01-15 3:11 ` [PATCH 1/2] clk: clk_resolve_parent_clk(): resolve external clocks by id chiffathefox
2026-01-17 1:38 ` Marek Vasut
2026-01-19 16:59 ` Kaustabh Chakraborty
2026-01-15 3:11 ` chiffathefox [this message]
2026-01-19 17:00 ` [PATCH 2/2] clk: exynos: do not reparent requested clock Kaustabh Chakraborty
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