Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 08/47] clk: ti: clkctrl: Fix returning uninitialized data | Date | Thu, 18 Jul 2019 12:01:22 +0900 |
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[ Upstream commit 41b3588dba6ef4b7995735a97e47ff0aeea6c276 ]
If we do a clk_get() for a clock that does not exists, we have _ti_omap4_clkctrl_xlate() return uninitialized data if no match is found. This can be seen in some cases with SLAB_DEBUG enabled:
Unable to handle kernel paging request at virtual address 5a5a5a5a ... clk_hw_create_clk.part.33 sysc_notifier_call notifier_call_chain blocking_notifier_call_chain device_add
Let's fix this by setting a found flag only when we find a match.
Reported-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Fixes: 88a172526c32 ("clk: ti: add support for clkctrl clocks") Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Tested-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/clk/ti/clkctrl.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c index ca3218337fd7..dfaa5aad0692 100644 --- a/drivers/clk/ti/clkctrl.c +++ b/drivers/clk/ti/clkctrl.c @@ -229,6 +229,7 @@ static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec, { struct omap_clkctrl_provider *provider = data; struct omap_clkctrl_clk *entry; + bool found = false; if (clkspec->args_count != 2) return ERR_PTR(-EINVAL); @@ -238,11 +239,13 @@ static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec, list_for_each_entry(entry, &provider->clocks, node) { if (entry->reg_offset == clkspec->args[0] && - entry->bit_offset == clkspec->args[1]) + entry->bit_offset == clkspec->args[1]) { + found = true; break; + } } - if (!entry) + if (!found) return ERR_PTR(-EINVAL); return entry->clk; -- 2.20.1
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