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authorKent Gibson <warthog618@gmail.com>2024-04-04 11:33:28 +0200
committerBartosz Golaszewski <bartosz.golaszewski@linaro.org>2024-04-04 18:57:08 +0200
commit83092341e15d0dfee1caa8dc502f66c815ccd78a (patch)
tree25798b039981a6e2897c624509d19e399e9bd988 /drivers/gpio/gpiolib-cdev.c
parentgpio: cdev: check for NULL labels when sanitizing them for irqs (diff)
downloadlinux-83092341e15d0dfee1caa8dc502f66c815ccd78a.tar.xz
linux-83092341e15d0dfee1caa8dc502f66c815ccd78a.zip
gpio: cdev: fix missed label sanitizing in debounce_setup()
When adding sanitization of the label, the path through edge_detector_setup() that leads to debounce_setup() was overlooked. 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 <warthog618@gmail.com> [Bartosz: rebased on top of the fix for empty GPIO labels] Co-developed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to '')
-rw-r--r--drivers/gpio/gpiolib-cdev.c49
1 files changed, 28 insertions, 21 deletions
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 1426cc1c4a28..d09c7d728365 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;
}
+static inline char *make_irq_label(const char *orig)
+{
+ char *new;
+
+ if (!orig)
+ return NULL;
+
+ new = 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
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;
/* try hardware */
ret = gpiod_set_debounce(line->desc, debounce_period_us);
@@ -1037,11 +1057,17 @@ static int debounce_setup(struct line *line, unsigned int debounce_period_us)
if (irq < 0)
return -ENXIO;
+ label = make_irq_label(line->req->label);
+ if (IS_ERR(label))
+ return -ENOMEM;
+
irqflags = IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
ret = request_irq(irq, debounce_irq_handler, irqflags,
- line->req->label, line);
- if (ret)
+ label, line);
+ if (ret) {
+ free_irq_label(label);
return ret;
+ }
line->irq = irq;
} else {
ret = hte_edge_setup(line, GPIO_V2_LINE_FLAG_EDGE_BOTH);
@@ -1083,25 +1109,6 @@ static u32 gpio_v2_line_config_debounce_period(struct gpio_v2_line_config *lc,
return 0;
}
-static inline char *make_irq_label(const char *orig)
-{
- char *new;
-
- if (!orig)
- return NULL;
-
- new = 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) {