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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>
This commit is contained in:
parent
95d465fd75
commit
2db6687633
1 changed files with 24 additions and 12 deletions
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@ -316,7 +316,8 @@ static struct input_device_id *input_match_device(struct input_device_id *id, st
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return NULL;
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}
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static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, int max)
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static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
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int max, int add_cr)
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{
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int i;
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int len = 0;
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@ -328,6 +329,10 @@ static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, in
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for (; i >= 0; i--)
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len += snprintf(buf + len, max(buf_size - len, 0),
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"%lx%s", bitmap[i], i > 0 ? " " : "");
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if (add_cr)
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len += snprintf(buf + len, max(buf_size - len, 0), "\n");
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return len;
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}
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@ -356,8 +361,7 @@ static unsigned int input_devices_poll(struct file *file, poll_table *wait)
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do { \
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len += sprintf(buf + len, "B: %s=", #ev); \
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len += input_print_bitmap(buf + len, INT_MAX, \
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dev->bm##bit, ev##_MAX); \
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len += sprintf(buf + len, "\n"); \
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dev->bm##bit, ev##_MAX, 1); \
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} while (0)
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#define TEST_AND_SPRINTF_BIT(ev, bm) \
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@ -517,7 +521,8 @@ static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
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if (retval) \
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return retval; \
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\
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retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : ""); \
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retval = scnprintf(buf, PAGE_SIZE, \
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"%s\n", input_dev->name ? input_dev->name : ""); \
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\
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mutex_unlock(&input_dev->mutex); \
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\
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@ -541,7 +546,8 @@ static int print_modalias_bits(char *buf, int size, char prefix, unsigned long *
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return len;
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}
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static int print_modalias(char *buf, int size, struct input_dev *id)
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static int input_print_modalias(char *buf, int size, struct input_dev *id,
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int add_cr)
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{
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int len;
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@ -569,6 +575,10 @@ static int print_modalias(char *buf, int size, struct input_dev *id)
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0, FF_MAX);
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len += print_modalias_bits(buf + len, size - len, 'w', id->swbit,
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0, SW_MAX);
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if (add_cr)
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len += snprintf(buf + len, size - len, "\n");
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return len;
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}
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@ -577,9 +587,9 @@ static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
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struct input_dev *id = to_input_dev(dev);
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ssize_t len;
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len = print_modalias(buf, PAGE_SIZE, id);
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len += snprintf(buf + len, PAGE_SIZE-len, "\n");
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return len;
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len = input_print_modalias(buf, PAGE_SIZE, id, 1);
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return max_t(int, len, PAGE_SIZE);
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}
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static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
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@ -599,7 +609,7 @@ static struct attribute_group input_dev_attr_group = {
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static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
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{ \
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struct input_dev *input_dev = to_input_dev(dev); \
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return sprintf(buf, "%04x\n", input_dev->id.name); \
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return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
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} \
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static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);
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@ -625,7 +635,9 @@ static struct attribute_group input_dev_id_attr_group = {
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static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
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{ \
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struct input_dev *input_dev = to_input_dev(dev); \
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return input_print_bitmap(buf, PAGE_SIZE, input_dev->bm##bit, ev##_MAX);\
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int len = input_print_bitmap(buf, PAGE_SIZE, \
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input_dev->bm##bit, ev##_MAX, 1); \
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return min_t(int, len, PAGE_SIZE); \
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} \
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static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);
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@ -684,7 +696,7 @@ static int input_add_uevent_bm_var(char **envp, int num_envp, int *cur_index,
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*cur_len += input_print_bitmap(buffer + *cur_len,
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max(buffer_size - *cur_len, 0),
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bitmap, max) + 1;
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bitmap, max, 0) + 1;
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if (*cur_len > buffer_size)
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return -ENOMEM;
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@ -747,7 +759,7 @@ static int input_dev_uevent(struct class_device *cdev, char **envp,
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envp[i++] = buffer + len;
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len += snprintf(buffer + len, buffer_size - len, "MODALIAS=");
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len += print_modalias(buffer + len, buffer_size - len, dev) + 1;
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len += input_print_modalias(buffer + len, buffer_size - len, dev, 0) + 1;
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envp[i] = NULL;
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return 0;
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