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authorDmitry Torokhov <dtor_core@ameritech.net>2006-04-02 00:09:26 -0500
committerDmitry Torokhov <dtor_core@ameritech.net>2006-04-02 00:09:26 -0500
commit2db66876334d6bf44414cb6225d134b751b1d7ff (patch)
treea02d1734d24df2bb7a89e8190577204d43b2385f /drivers
parent95d465fd750897ab32462a6702fbfe1b122cbbc0 (diff)
Input: limit attributes' output to PAGE_SIZE
sysfs can't handle more than PAGE_SIZE data coming from attributes' show() methods; make sure we respect this limit. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/input.c36
1 files changed, 24 insertions, 12 deletions
diff --git a/drivers/input/input.c b/drivers/input/input.c
index de94ffcb099..8dcd3931fa6 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -316,7 +316,8 @@ static struct input_device_id *input_match_device(struct input_device_id *id, st
return NULL;
}
-static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, int max)
+static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
+ int max, int add_cr)
{
int i;
int len = 0;
@@ -328,6 +329,10 @@ static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, in
for (; i >= 0; i--)
len += snprintf(buf + len, max(buf_size - len, 0),
"%lx%s", bitmap[i], i > 0 ? " " : "");
+
+ if (add_cr)
+ len += snprintf(buf + len, max(buf_size - len, 0), "\n");
+
return len;
}
@@ -356,8 +361,7 @@ static unsigned int input_devices_poll(struct file *file, poll_table *wait)
do { \
len += sprintf(buf + len, "B: %s=", #ev); \
len += input_print_bitmap(buf + len, INT_MAX, \
- dev->bm##bit, ev##_MAX); \
- len += sprintf(buf + len, "\n"); \
+ dev->bm##bit, ev##_MAX, 1); \
} while (0)
#define TEST_AND_SPRINTF_BIT(ev, bm) \
@@ -517,7 +521,8 @@ static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
if (retval) \
return retval; \
\
- retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : ""); \
+ retval = scnprintf(buf, PAGE_SIZE, \
+ "%s\n", input_dev->name ? input_dev->name : ""); \
\
mutex_unlock(&input_dev->mutex); \
\
@@ -541,7 +546,8 @@ static int print_modalias_bits(char *buf, int size, char prefix, unsigned long *
return len;
}
-static int print_modalias(char *buf, int size, struct input_dev *id)
+static int input_print_modalias(char *buf, int size, struct input_dev *id,
+ int add_cr)
{
int len;
@@ -569,6 +575,10 @@ static int print_modalias(char *buf, int size, struct input_dev *id)
0, FF_MAX);
len += print_modalias_bits(buf + len, size - len, 'w', id->swbit,
0, SW_MAX);
+
+ if (add_cr)
+ len += snprintf(buf + len, size - len, "\n");
+
return len;
}
@@ -577,9 +587,9 @@ static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
struct input_dev *id = to_input_dev(dev);
ssize_t len;
- len = print_modalias(buf, PAGE_SIZE, id);
- len += snprintf(buf + len, PAGE_SIZE-len, "\n");
- return len;
+ len = input_print_modalias(buf, PAGE_SIZE, id, 1);
+
+ return max_t(int, len, PAGE_SIZE);
}
static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
@@ -599,7 +609,7 @@ static struct attribute_group input_dev_attr_group = {
static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
{ \
struct input_dev *input_dev = to_input_dev(dev); \
- return sprintf(buf, "%04x\n", input_dev->id.name); \
+ return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
} \
static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
@@ -625,7 +635,9 @@ static struct attribute_group input_dev_id_attr_group = {
static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
{ \
struct input_dev *input_dev = to_input_dev(dev); \
- return input_print_bitmap(buf, PAGE_SIZE, input_dev->bm##bit, ev##_MAX);\
+ int len = input_print_bitmap(buf, PAGE_SIZE, \
+ input_dev->bm##bit, ev##_MAX, 1); \
+ return min_t(int, len, PAGE_SIZE); \
} \
static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
@@ -684,7 +696,7 @@ static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
*cur_len += input_print_bitmap(buffer + *cur_len,
max(buffer_size - *cur_len, 0),
- bitmap, max) + 1;
+ bitmap, max, 0) + 1;
if (*cur_len > buffer_size)
return -ENOMEM;
@@ -747,7 +759,7 @@ static int input_dev_uevent(struct class_device *cdev, char **envp,
envp[i++] = buffer + len;
len += snprintf(buffer + len, buffer_size - len, "MODALIAS=");
- len += print_modalias(buffer + len, buffer_size - len, dev) + 1;
+ len += input_print_modalias(buffer + len, buffer_size - len, dev, 0) + 1;
envp[i] = NULL;
return 0;