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drm: sysfs: Use scnprintf() for avoiding potential buffer overflow
Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Signed-off-by: Takashi Iwai <tiwai@suse.de> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20200311073540.7108-1-tiwai@suse.de
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@ -228,7 +228,7 @@ static ssize_t modes_show(struct device *device,
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mutex_lock(&connector->dev->mode_config.mutex);
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mutex_lock(&connector->dev->mode_config.mutex);
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list_for_each_entry(mode, &connector->modes, head) {
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list_for_each_entry(mode, &connector->modes, head) {
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written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
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written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
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mode->name);
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mode->name);
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}
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}
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mutex_unlock(&connector->dev->mode_config.mutex);
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mutex_unlock(&connector->dev->mode_config.mutex);
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