linux-kernel - [PATCH 5.12 167/296] Revert "net: fujitsu: fix a potential NULL pointer dereference"

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Message-Id: <20210531130709.484133072@linuxfoundation.org>
Date:   Mon, 31 May 2021 15:13:42 +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>,
        "David S. Miller" <davem@...emloft.net>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 167/296] Revert "net: fujitsu: fix a potential NULL pointer dereference"

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

[ Upstream commit 5f94eaa4ee23e80841fa359a372f84cfe25daee1 ]

This reverts commit 9f4d6358e11bbc7b839f9419636188e4151fb6e4.

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 change does not change any behavior as the caller of this
function onlyu checks for "== -1" as an error condition so this error is
not handled properly.  Remove this change and it will be fixed up
properly in a later commit.

Cc: Kangjie Lu <kjlu@....edu>
Cc: David S. Miller <davem@...emloft.net>
Reviewed-by: Dominik Brodowski <linux@...inikbrodowski.net>
Link: https://lore.kernel.org/r/20210503115736.2104747-15-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/fujitsu/fmvj18x_cs.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/net/ethernet/fujitsu/fmvj18x_cs.c b/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
index a7b7a4aace79..dc90c61fc827 100644
--- a/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
+++ b/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
@@ -547,11 +547,6 @@ static int fmvj18x_get_hwinfo(struct pcmcia_device *link, u_char *node_id)
 	return -1;
 
     base = ioremap(link->resource[2]->start, resource_size(link->resource[2]));
-    if (!base) {
-	    pcmcia_release_window(link, link->resource[2]);
-	    return -ENOMEM;
-    }
-
     pcmcia_map_mem_page(link, link->resource[2], 0);
 
     /*
-- 
2.30.2