[PATCH 6.1.y 2/5] ALSA: emux: fix validation of snd_emux.num_ports

[Sasha Levin <sashal@kernel.org>]

From: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>

[ Upstream commit 19061f35b3eaf4925960be44d870244b99df8d1d ]

Both bounds had off-by-one errors.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Message-ID: <20240406064830.1029573-4-oswald.buddenhagen@gmx.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Stable-dep-of: 34e3e04b8a17 ("ALSA: emux: Fix UAF of soundfont zones at note-on")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/synth/emux/emux_seq.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/synth/emux/emux_seq.c b/sound/synth/emux/emux_seq.c
index b227c7e0bc2ac..1adaa75df2f6a 100644
--- a/sound/synth/emux/emux_seq.c
+++ b/sound/synth/emux/emux_seq.c
@@ -65,11 +65,11 @@ snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index)
 		return -ENODEV;
 	}
 
-	if (emu->num_ports < 0) {
+	if (emu->num_ports <= 0) {
 		snd_printk(KERN_WARNING "seqports must be greater than zero\n");
 		emu->num_ports = 1;
-	} else if (emu->num_ports >= SNDRV_EMUX_MAX_PORTS) {
-		snd_printk(KERN_WARNING "too many ports."
+	} else if (emu->num_ports > SNDRV_EMUX_MAX_PORTS) {
+		snd_printk(KERN_WARNING "too many ports. "
 			   "limited max. ports %d\n", SNDRV_EMUX_MAX_PORTS);
 		emu->num_ports = SNDRV_EMUX_MAX_PORTS;
 	}
-- 
2.53.0