linux-kernel - [PATCH 4.4 07/31] Revert "ALSA: sb8: add a check for request

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210524152323.163207726@linuxfoundation.org>
Date:   Mon, 24 May 2021 17:24:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kangjie Lu <kjlu@....edu>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.4 07/31] Revert "ALSA: sb8: add a check for request_region"

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

commit 94f88309f201821073f57ae6005caefa61bf7b7e upstream.

This reverts commit dcd0feac9bab901d5739de51b3f69840851f8919.

Because of recent interactions with developers from @umn.edu, all
commits from them have been recently re-reviewed to ensure if they were
correct or not.

Upon review, this commit was found to be incorrect for the reasons
below, so it must be reverted.  It will be fixed up "correctly" in a
later kernel change.

The original commit message for this change was incorrect as the code
path can never result in a NULL dereference, alluding to the fact that
whatever tool was used to "find this" is broken.  It's just an optional
resource reservation, so removing this check is fine.

Cc: Kangjie Lu <kjlu@....edu>
Acked-by: Takashi Iwai <tiwai@...e.de>
Fixes: dcd0feac9bab ("ALSA: sb8: add a check for request_region")
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20210503115736.2104747-35-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/isa/sb/sb8.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/sound/isa/sb/sb8.c
+++ b/sound/isa/sb/sb8.c
@@ -111,10 +111,6 @@ static int snd_sb8_probe(struct device *

 	/* block the 0x388 port to avoid PnP conflicts */
 	acard->fm_res = request_region(0x388, 4, "SoundBlaster FM");
-	if (!acard->fm_res) {
-		err = -EBUSY;
-		goto _err;
-	}

 	if (port[dev] != SNDRV_AUTO_PORT) {
 		if ((err = snd_sbdsp_create(card, port[dev], irq[dev],