linux-kernel - [PATCH 184/190] Revert "yam: fix a missing-check bug"

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Message-Id: <20210421130105.1226686-185-gregkh@linuxfoundation.org>
Date:   Wed, 21 Apr 2021 15:00:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wenwen Wang <wang6495@....edu>,
        "David S . Miller" <davem@...emloft.net>
Subject: [PATCH 184/190] Revert "yam: fix a missing-check bug"

This reverts commit 0781168e23a2fc8dceb989f11fc5b39b3ccacc35.

Commits from @umn.edu addresses have been found to be submitted in "bad
faith" to try to test the kernel community's ability to review "known
malicious" changes.  The result of these submissions can be found in a
paper published at the 42nd IEEE Symposium on Security and Privacy
entitled, "Open Source Insecurity: Stealthily Introducing
Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
of Minnesota) and Kangjie Lu (University of Minnesota).

Because of this, all submissions from this group must be reverted from
the kernel tree and will need to be re-reviewed again to determine if
they actually are a valid fix.  Until that work is complete, remove this
change to ensure that no problems are being introduced into the
codebase.

Cc: Wenwen Wang <wang6495@....edu>
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/hamradio/yam.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 5ab53e9942f3..616db3a0d2f4 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -951,8 +951,6 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 				 sizeof(struct yamdrv_ioctl_mcs));
 		if (IS_ERR(ym))
 			return PTR_ERR(ym);
-		if (ym->cmd != SIOCYAMSMCS)
-			return -EINVAL;
 		if (ym->bitrate > YAM_MAXBITRATE) {
 			kfree(ym);
 			return -EINVAL;
@@ -968,8 +966,6 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 		if (copy_from_user(&yi, ifr->ifr_data, sizeof(struct yamdrv_ioctl_cfg)))
 			 return -EFAULT;

-		if (yi.cmd != SIOCYAMSCFG)
-			return -EINVAL;
 		if ((yi.cfg.mask & YAM_IOBASE) && netif_running(dev))
 			return -EINVAL;		/* Cannot change this parameter when up */
 		if ((yi.cfg.mask & YAM_IRQ) && netif_running(dev))
-- 
2.31.1