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A request taking this path does not allocate a new label and the request label is freed twice when the request is released, resulting in memory corruption. Add label sanitization to debounce_setup(). Cc: stable@vger.kernel.org Fixes: b34490879baa ("gpio: cdev: sanitize the label before requesting the = interrupt") Signed-off-by: Kent Gibson [Bartosz: rebased on top of the fix for empty GPIO labels] Co-developed-by: Bartosz Golaszewski Signed-off-by: Bartosz Golaszewski --- drivers/gpio/gpiolib-cdev.c | 47 +++++++++++++++++++++---------------- 1 file changed, 27 insertions(+), 20 deletions(-) diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index 1426cc1c4a28..6fe978535047 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -728,6 +728,25 @@ static u32 line_event_id(int level) GPIO_V2_LINE_EVENT_FALLING_EDGE; } =20 +static inline char *make_irq_label(const char *orig) +{ + char *new; + + if (!orig) + return NULL; + + new =3D kstrdup_and_replace(orig, '/', ':', GFP_KERNEL); + if (!new) + return ERR_PTR(-ENOMEM); + + return new; +} + +static inline void free_irq_label(const char *label) +{ + kfree(label); +} + #ifdef CONFIG_HTE =20 static enum hte_return process_hw_ts_thread(void *p) @@ -1015,6 +1034,7 @@ static int debounce_setup(struct line *line, unsigned= int debounce_period_us) { unsigned long irqflags; int ret, level, irq; + char *label; =20 /* try hardware */ ret =3D gpiod_set_debounce(line->desc, debounce_period_us); @@ -1037,11 +1057,17 @@ static int debounce_setup(struct line *line, unsign= ed int debounce_period_us) if (irq < 0) return -ENXIO; =20 + label =3D make_irq_label(line->req->label); + if (IS_ERR(label)) + return -ENOMEM; + irqflags =3D IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING; ret =3D request_irq(irq, debounce_irq_handler, irqflags, line->req->label, line); - if (ret) + if (ret) { + free_irq_label(label); return ret; + } line->irq =3D irq; } else { ret =3D hte_edge_setup(line, GPIO_V2_LINE_FLAG_EDGE_BOTH); @@ -1083,25 +1109,6 @@ static u32 gpio_v2_line_config_debounce_period(struc= t gpio_v2_line_config *lc, return 0; } =20 -static inline char *make_irq_label(const char *orig) -{ - char *new; - - if (!orig) - return NULL; - - new =3D kstrdup_and_replace(orig, '/', ':', GFP_KERNEL); - if (!new) - return ERR_PTR(-ENOMEM); - - return new; -} - -static inline void free_irq_label(const char *label) -{ - kfree(label); -} - static void edge_detector_stop(struct line *line) { if (line->irq) { --=20 2.40.1