Commit 5885615e authored by Dan Carpenter's avatar Dan Carpenter Committed by Takashi Iwai
Browse files

ALSA: emux: stop if copy_from_user() fails

If we can't fill the "patch" struct because "count" is too small (it can
be as low as 4 bytes) or because copy_from_user() failed, then just
return instead of using unintialized data.
Signed-off-by: default avatarDan Carpenter <>
Signed-off-by: default avatarTakashi Iwai <>
parent 03a1f48e
......@@ -225,9 +225,9 @@ snd_emux_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
else if (format == SNDRV_OSS_SOUNDFONT_PATCH) {
struct soundfont_patch_info patch;
if (count < (int)sizeof(patch))
rc = -EINVAL;
return -EINVAL;
if (copy_from_user(&patch, buf, sizeof(patch)))
rc = -EFAULT;
return -EFAULT;
if (patch.type >= SNDRV_SFNT_LOAD_INFO &&
patch.type <= SNDRV_SFNT_PROBE_DATA)
rc = snd_soundfont_load(emu->sflist, buf, count, SF_CLIENT_NO(p->chset.port));
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