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| author | Takashi Iwai <tiwai@suse.de> | 2019-11-09 19:16:58 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-11-09 19:17:49 +0100 |
| commit | 167beb1756791e0806365a3f86a0da10d7a327ee (patch) | |
| tree | 2b62898da945bd02481869a6c763b70cd7bf74d8 | |
| parent | df37d941c4b5aee9259ab4e34de8bfda384f7681 (diff) | |
| download | linux-167beb1756791e0806365a3f86a0da10d7a327ee.tar.bz2 | |
ALSA: usb-audio: Fix missing error check at mixer resolution test
A check of the return value from get_cur_mix_raw() is missing at the
resolution test code in get_min_max_with_quirks(), which may leave the
variable untouched, leading to a random uninitialized value, as
detected by syzkaller fuzzer.
Add the missing return error check for fixing that.
Reported-and-tested-by: syzbot+abe1ab7afc62c6bb6377@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191109181658.30368-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/usb/mixer.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 3fd1d1749edf..45eee5cc312e 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1229,7 +1229,8 @@ static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval, if (cval->min + cval->res < cval->max) { int last_valid_res = cval->res; int saved, test, check; - get_cur_mix_raw(cval, minchn, &saved); + if (get_cur_mix_raw(cval, minchn, &saved) < 0) + goto no_res_check; for (;;) { test = saved; if (test < cval->max) @@ -1249,6 +1250,7 @@ static int get_min_max_with_quirks(struct usb_mixer_elem_info *cval, snd_usb_set_cur_mix_value(cval, minchn, 0, saved); } +no_res_check: cval->initialized = 1; } |