linux-kernel - [PATCH AUTOSEL 5.6 112/149] brcmfmac: Fix double freeing in the fmac usb data path

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Message-Id: <20200411230347.22371-112-sashal@kernel.org>
Date:   Sat, 11 Apr 2020 19:03:09 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Raveendran Somu <raveendran.somu@...ress.com>,
        Chi-hsien Lin <chi-hsien.lin@...ress.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.6 112/149] brcmfmac: Fix double freeing in the fmac usb data path

From: Raveendran Somu <raveendran.somu@...ress.com>

[ Upstream commit 78179869dc3f5c0059bbf5d931a2717f1ad97ecd ]

When the brcmf_fws_process_skb() fails to get hanger slot for
queuing the skb, it tries to free the skb.
But the caller brcmf_netdev_start_xmit() of that funciton frees
the packet on error return value.
This causes the double freeing and which caused the kernel crash.

Signed-off-by: Raveendran Somu <raveendran.somu@...ress.com>
Signed-off-by: Chi-hsien Lin <chi-hsien.lin@...ress.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/1585124429-97371-3-git-send-email-chi-hsien.lin@cypress.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
index 5e1a11c075517..10022c7653545 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
@@ -2145,8 +2145,7 @@ int brcmf_fws_process_skb(struct brcmf_if *ifp, struct sk_buff *skb)
 		brcmf_fws_enq(fws, BRCMF_FWS_SKBSTATE_DELAYED, fifo, skb);
 		brcmf_fws_schedule_deq(fws);
 	} else {
-		bphy_err(drvr, "drop skb: no hanger slot\n");
-		brcmf_txfinalize(ifp, skb, false);
+		bphy_err(drvr, "no hanger slot available\n");
 		rc = -ENOMEM;
 	}
 	brcmf_fws_unlock(fws);
-- 
2.20.1