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| author | Takashi Iwai <tiwai@suse.de> | 2019-11-09 21:16:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-20 20:45:12 +0300 |
| commit | a2c763cd9609cdbf3c0b88c887a4f2e440e4cb3c (patch) | |
| tree | ab5ad190598c54e4ced8f09d4c1b11e9c6a6ac12 /sound/usb/mixer.c | |
| parent | edc471038b4846b119d0b025f0336bf4b3e1ce23 (diff) | |
| download | linux-a2c763cd9609cdbf3c0b88c887a4f2e440e4cb3c.tar.xz | |
ALSA: usb-audio: Fix missing error check at mixer resolution test
commit 167beb1756791e0806365a3f86a0da10d7a327ee upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/usb/mixer.c')
| -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 bb67131e6437..726cbd63a0c7 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -1244,7 +1244,8 @@ 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) @@ -1264,6 +1265,7 @@ 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; } |