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Fri, 01 Mar 2024 16:52:19 -0800 (PST) Received: from [127.0.1.1] ([176.61.106.68]) by smtp.gmail.com with ESMTPSA id f15-20020adffccf000000b0033dedd63382sm5865501wrs.101.2024.03.01.16.52.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Mar 2024 16:52:19 -0800 (PST) From: Bryan O'Donoghue Date: Sat, 02 Mar 2024 00:52:14 +0000 Subject: [PATCH 1/2] clk: Fix clk_core_get NULL dereference Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240302-linux-next-24-03-01-simple-clock-fixes-v1-1-25f348a5982b@linaro.org> References: <20240302-linux-next-24-03-01-simple-clock-fixes-v1-0-25f348a5982b@linaro.org> In-Reply-To: <20240302-linux-next-24-03-01-simple-clock-fixes-v1-0-25f348a5982b@linaro.org> To: Michael Turquette , Stephen Boyd , Bjorn Andersson , Konrad Dybcio , Rajendra Nayak , Abel Vesa Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Bryan O'Donoghue X-Mailer: b4 0.14-dev It is possible for clk_core_get to dereference a NULL in the following sequence: clk_core_get() of_clk_get_hw_from_clkspec() __of_clk_get_hw_from_provider() __clk_get_hw() __clk_get_hw() can return NULL which is dereferenced by clk_core_get() at hw->core. Prior to commit dde4eff47c82 ("clk: Look for parents with clkdev based clk_lookups") the check IS_ERR_OR_NULL() was performed which would have caught the NULL. Reading the description of this function it talks about returning NULL but that cannot be so at the moment. Update the function to check for hw before dereferencing it and return NULL if hw is NULL. Fixes: dde4eff47c82 ("clk: Look for parents with clkdev based clk_lookups") Signed-off-by: Bryan O'Donoghue --- drivers/clk/clk.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index a3bc7fb90d0f..25371c91a58f 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -418,6 +418,9 @@ static struct clk_core *clk_core_get(struct clk_core *core, u8 p_index) if (IS_ERR(hw)) return ERR_CAST(hw); + if (!hw) + return NULL; + return hw->core; }