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| author | Dan Carpenter <error27@gmail.com> | 2010-09-09 00:11:41 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2010-09-09 09:05:21 +0200 |
| commit | a7a13d0676335a7dc9dd72264cca02606e43aaba (patch) | |
| tree | 5c9a4c47f735174d13d3ab6d64c8c191d70d0968 /sound | |
| parent | 27f7ad53829f79e799a253285318bff79ece15bd (diff) | |
| download | lwn-a7a13d0676335a7dc9dd72264cca02606e43aaba.tar.gz lwn-a7a13d0676335a7dc9dd72264cca02606e43aaba.zip | |
ALSA: rawmidi: fix the get next midi device ioctl
If we pass in a device which is higher than SNDRV_RAWMIDI_DEVICES then
the "next device" should be -1. This function just returns device + 1.
But the main thing is that "device + 1" can lead to a (harmless) integer
overflow and that annoys static analysis tools.
[fix the case for device == SNDRV_RAWMIDI_DEVICE by tiwai]
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/core/rawmidi.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c index eb68326c37d4..a7868ad4d530 100644 --- a/sound/core/rawmidi.c +++ b/sound/core/rawmidi.c @@ -829,6 +829,8 @@ static int snd_rawmidi_control_ioctl(struct snd_card *card, if (get_user(device, (int __user *)argp)) return -EFAULT; + if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */ + device = SNDRV_RAWMIDI_DEVICES - 1; mutex_lock(®ister_mutex); device = device < 0 ? 0 : device + 1; while (device < SNDRV_RAWMIDI_DEVICES) { |