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drm: sysfs: Use scnprintf() for avoiding potential buffer overflow

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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
This commit is contained in:
Takashi Iwai 2020-03-11 08:35:40 +01:00 committed by Thomas Zimmermann
parent 41252c6d1c
commit 9b9f2219b2
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_sysfs.c
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@ -228,7 +228,7 @@ static ssize_t modes_show(struct device *device,
mutex_lock(&connector->dev->mode_config.mutex);
list_for_each_entry(mode, &connector->modes, head) {
written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
written += scnprintf(buf + written, PAGE_SIZE - written, "%s\n",
mode->name);
}
mutex_unlock(&connector->dev->mode_config.mutex);