From: Arnd Bergmann <arnd@arndb.de> To: Michael Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@codeaurora.org> Cc: Arnd Bergmann <arnd@arndb.de>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Alexandre Torgue <alexandre.torgue@st.com>, Gabriel Fernandez <gabriel.fernandez@st.com>, Rob Herring <robh@kernel.org>, Christophe JAILLET <christophe.jaillet@wanadoo.fr>, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] clk: stm32f4: avoid uninitialized variable access Date: Wed, 11 Jan 2017 14:40:52 +0100 [thread overview] Message-ID: <20170111134107.3821564-1-arnd@arndb.de> (raw) The failure path in the newly added function tries to free an uninitialized pointer: drivers/clk/clk-stm32f4.c: In function 'stm32f4_rcc_init': drivers/clk/clk-stm32f4.c:1106:4: error: 'gate' may be used uninitialized in this function [-Werror=maybe-uninitialized] I'm adding an initialization to NULL here to make the kfree() succeed, and I'm also rearranging the cleanup so that the same kfree() is used for any error path, making the function slightly more robust against newly introduced bugs in the error handling. Fixes: daf2d117cbca ("clk: stm32f4: Add lcd-tft clock") Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- drivers/clk/clk-stm32f4.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c index 42f8534996de..4a3bb6e63525 100644 --- a/drivers/clk/clk-stm32f4.c +++ b/drivers/clk/clk-stm32f4.c @@ -1080,7 +1080,7 @@ static struct clk_hw *stm32_register_aux_clk(const char *name, unsigned long flags, spinlock_t *lock) { struct clk_hw *hw; - struct clk_gate *gate; + struct clk_gate *gate = NULL; struct clk_mux *mux = NULL; struct clk_hw *mux_hw = NULL, *gate_hw = NULL; const struct clk_ops *mux_ops = NULL, *gate_ops = NULL; @@ -1103,7 +1103,6 @@ static struct clk_hw *stm32_register_aux_clk(const char *name, if (offset_mux != NO_MUX) { mux = kzalloc(sizeof(*mux), GFP_KERNEL); if (!mux) { - kfree(gate); hw = ERR_PTR(-EINVAL); goto fail; } @@ -1116,8 +1115,10 @@ static struct clk_hw *stm32_register_aux_clk(const char *name, mux_ops = &clk_mux_ops; } - if (mux_hw == NULL && gate_hw == NULL) - return ERR_PTR(-EINVAL); + if (mux_hw == NULL && gate_hw == NULL) { + hw = ERR_PTR(-EINVAL); + goto fail; + } hw = clk_hw_register_composite(NULL, name, parent_names, num_parents, mux_hw, mux_ops, @@ -1125,11 +1126,12 @@ static struct clk_hw *stm32_register_aux_clk(const char *name, gate_hw, gate_ops, flags); +fail: if (IS_ERR(hw)) { kfree(gate); kfree(mux); } -fail: + return hw; } -- 2.9.0
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] clk: stm32f4: avoid uninitialized variable access Date: Wed, 11 Jan 2017 14:40:52 +0100 [thread overview] Message-ID: <20170111134107.3821564-1-arnd@arndb.de> (raw) The failure path in the newly added function tries to free an uninitialized pointer: drivers/clk/clk-stm32f4.c: In function 'stm32f4_rcc_init': drivers/clk/clk-stm32f4.c:1106:4: error: 'gate' may be used uninitialized in this function [-Werror=maybe-uninitialized] I'm adding an initialization to NULL here to make the kfree() succeed, and I'm also rearranging the cleanup so that the same kfree() is used for any error path, making the function slightly more robust against newly introduced bugs in the error handling. Fixes: daf2d117cbca ("clk: stm32f4: Add lcd-tft clock") Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- drivers/clk/clk-stm32f4.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c index 42f8534996de..4a3bb6e63525 100644 --- a/drivers/clk/clk-stm32f4.c +++ b/drivers/clk/clk-stm32f4.c @@ -1080,7 +1080,7 @@ static struct clk_hw *stm32_register_aux_clk(const char *name, unsigned long flags, spinlock_t *lock) { struct clk_hw *hw; - struct clk_gate *gate; + struct clk_gate *gate = NULL; struct clk_mux *mux = NULL; struct clk_hw *mux_hw = NULL, *gate_hw = NULL; const struct clk_ops *mux_ops = NULL, *gate_ops = NULL; @@ -1103,7 +1103,6 @@ static struct clk_hw *stm32_register_aux_clk(const char *name, if (offset_mux != NO_MUX) { mux = kzalloc(sizeof(*mux), GFP_KERNEL); if (!mux) { - kfree(gate); hw = ERR_PTR(-EINVAL); goto fail; } @@ -1116,8 +1115,10 @@ static struct clk_hw *stm32_register_aux_clk(const char *name, mux_ops = &clk_mux_ops; } - if (mux_hw == NULL && gate_hw == NULL) - return ERR_PTR(-EINVAL); + if (mux_hw == NULL && gate_hw == NULL) { + hw = ERR_PTR(-EINVAL); + goto fail; + } hw = clk_hw_register_composite(NULL, name, parent_names, num_parents, mux_hw, mux_ops, @@ -1125,11 +1126,12 @@ static struct clk_hw *stm32_register_aux_clk(const char *name, gate_hw, gate_ops, flags); +fail: if (IS_ERR(hw)) { kfree(gate); kfree(mux); } -fail: + return hw; } -- 2.9.0
next reply other threads:[~2017-01-11 13:41 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-01-11 13:40 Arnd Bergmann [this message] 2017-01-11 13:40 ` [PATCH] clk: stm32f4: avoid uninitialized variable access Arnd Bergmann 2017-01-11 16:08 ` Gabriel Fernandez 2017-01-11 16:08 ` Gabriel Fernandez 2017-01-12 22:06 ` Stephen Boyd 2017-01-12 22:06 ` Stephen Boyd 2017-01-12 22:42 ` Arnd Bergmann 2017-01-12 22:42 ` Arnd Bergmann 2017-01-12 22:56 ` Stephen Boyd 2017-01-12 22:56 ` Stephen Boyd
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