From: Dan Carpenter Date: Fri, 26 Aug 2022 15:01:10 +0000 (+0300) Subject: ALSA: control: Re-order bounds checking in get_ctl_id_hash() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5934d9a0383619c14df91af8fd76261dc3de2f5f;p=linux.git ALSA: control: Re-order bounds checking in get_ctl_id_hash() These two checks are in the reverse order so it might read one element beyond the end of the array. First check if the "i" is within bounds before using it. Fixes: 6ab55ec0a938 ("ALSA: control: Fix an out-of-bounds bug in get_ctl_id_hash()") Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/YwjgNh/gkG1hH7po@kili Signed-off-by: Takashi Iwai --- diff --git a/sound/core/control.c b/sound/core/control.c index e8fc4c511e5ff..a7271927d875f 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -391,7 +391,7 @@ static unsigned long get_ctl_id_hash(const struct snd_ctl_elem_id *id) h = id->iface; h = MULTIPLIER * h + id->device; h = MULTIPLIER * h + id->subdevice; - for (i = 0; id->name[i] && i < SNDRV_CTL_ELEM_ID_NAME_MAXLEN; i++) + for (i = 0; i < SNDRV_CTL_ELEM_ID_NAME_MAXLEN && id->name[i]; i++) h = MULTIPLIER * h + id->name[i]; h = MULTIPLIER * h + id->index; h &= LONG_MAX;