From: Artemii Karasev <karasev@ispras.ru>
Date: Thu, 19 Jan 2023 08:22:59 +0000 (-0800)
Subject: ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1b9256c96220bcdba287eeeb90e7c910c77f8c46;p=linux.git

ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()

[ Upstream commit b9cee506da2b7920b5ea02ccd8e78a907d0ee7aa ]

snd_hda_get_connections() can return a negative error code.
It may lead to accessing 'conn' array at a negative index.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Artemii Karasev <karasev@ispras.ru>
Fixes: 30b4503378c9 ("ALSA: hda - Expose secret DAC-AA connection of some VIA codecs")
Link: https://lore.kernel.org/r/20230119082259.3634-1-karasev@ispras.ru
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/sound/pci/hda/patch_via.c b/sound/pci/hda/patch_via.c
index a188901a83bbe..29abc96dc146c 100644
--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -821,6 +821,9 @@ static int add_secret_dac_path(struct hda_codec *codec)
 		return 0;
 	nums = snd_hda_get_connections(codec, spec->gen.mixer_nid, conn,
 				       ARRAY_SIZE(conn) - 1);
+	if (nums < 0)
+		return nums;
+
 	for (i = 0; i < nums; i++) {
 		if (get_wcaps_type(get_wcaps(codec, conn[i])) == AC_WID_AUD_OUT)
 			return 0;