linux-kernel - [PATCH][next] ALSA: rawmidi: fix incorrect array bounds check on clock

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Message-Id: <20210519105424.55221-1-colin.king@canonical.com>
Date:   Wed, 19 May 2021 11:54:24 +0100
From:   Colin King <colin.king@...onical.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        David Henningsson <coding@...ic.se>,
        alsa-devel@...a-project.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] ALSA: rawmidi: fix incorrect array bounds check on clock_names

From: Colin Ian King <colin.king@...onical.com>

The array bounds check on clock_names is currently checking the size
of the entire array rather than the number of elements in the array
leading to a potential array bounds read error. Fix this by using
the ARRAY_SIZE macro instead of sizeof.

Addresses-Coverity: ("Out-of-bounds read")
Fixes: 08fdced60ca0 ("ALSA: rawmidi: Add framing mode")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 sound/core/rawmidi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index 4a6534db77d6..6c0a4a67ad2e 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -1679,7 +1679,7 @@ static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
 					    buffer_size, avail, xruns);
 				if (substream->framing == SNDRV_RAWMIDI_MODE_FRAMING_TSTAMP) {
 					clock_type = substream->clock_type >> SNDRV_RAWMIDI_MODE_CLOCK_SHIFT;
-					if (!snd_BUG_ON(clock_type >= sizeof(clock_names)))
+					if (!snd_BUG_ON(clock_type >= ARRAY_SIZE(clock_names)))
 						snd_iprintf(buffer,
 							    "  Framing      : tstamp\n"
 							    "  Clock type   : %s\n",
-- 
2.31.1