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ALSA: info: Limit the proc text input size

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commit 027a9fe683 upstream.

The ALSA proc handler allows currently the write in the unlimited size
until kmalloc() fails.  But basically the write is supposed to be only
for small inputs, mostly for one line inputs, and we don't have to
handle too large sizes at all.  Since the kmalloc error results in the
kernel warning, it's better to limit the size beforehand.

This patch adds the limit of 16kB, which must be large enough for the
currently existing code.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2016-10-30 22:18:45 +01:00 committed by Greg Kroah-Hartman
parent c1ea2b3c07
commit f3155797b9
1 changed files with 3 additions and 0 deletions
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3
sound/core/info.c
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@ -331,6 +331,9 @@ static ssize_t snd_info_text_entry_write(struct file *file,
if (!valid_pos(pos, count))
return -EIO;
next = pos + count;
/* don't handle too large text inputs */
if (next > 16 * 1024)
return -EIO;
mutex_lock(&entry->access);
buf = data->wbuffer;
if (!buf) {