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Wed, 16 Oct 2024 08:56:57 -0700 (PDT) Received: from localhost ([194.120.133.34]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37d7fbf8567sm4661078f8f.76.2024.10.16.08.56.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Oct 2024 08:56:56 -0700 (PDT) From: Colin Ian King To: Drew Fustini , Guo Ren , Fu Wei , Linus Walleij , Emil Renner Berthing , linux-riscv@lists.infradead.org, linux-gpio@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH][next] pinctrl: th1520: Fix potential null pointer dereference on func Date: Wed, 16 Oct 2024 16:56:55 +0100 Message-Id: <20241016155655.334518-1-colin.i.king@gmail.com> X-Mailer: git-send-email 2.39.5 Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The initialization of muxtype deferences pointer func before func is sanity checked with a null pointer check, hence we have a null pointer deference issue. Fix this by only deferencing func with the assignment to muxtype after func has been null pointer checked. Fixes: 1fc30cd92770 ("pinctrl: th1520: Factor out casts") Signed-off-by: Colin Ian King Acked-by: Drew Fustini --- drivers/pinctrl/pinctrl-th1520.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/pinctrl/pinctrl-th1520.c b/drivers/pinctrl/pinctrl-th1520.c index 7474d8da32f9..e641bad6728c 100644 --- a/drivers/pinctrl/pinctrl-th1520.c +++ b/drivers/pinctrl/pinctrl-th1520.c @@ -803,11 +803,12 @@ static int th1520_pinmux_set_mux(struct pinctrl_dev *pctldev, { struct th1520_pinctrl *thp = pinctrl_dev_get_drvdata(pctldev); const struct function_desc *func = pinmux_generic_get_function(pctldev, fsel); - enum th1520_muxtype muxtype = (uintptr_t)func->data; + enum th1520_muxtype muxtype; if (!func) return -EINVAL; + muxtype = (uintptr_t)func->data; return th1520_pinmux_set(thp, thp->desc.pins[gsel].number, th1520_pad_muxdata(thp->desc.pins[gsel].drv_data), muxtype);