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Date:   Sat, 11 Apr 2020 19:09:13 -0400
From:   Sasha Levin <>
Cc:     Raveendran Somu <>,
        Chi-hsien Lin <>,
        Kalle Valo <>,
        Sasha Levin <>,,,,
Subject: [PATCH AUTOSEL 5.4 078/108] brcmfmac: Fix double freeing in the fmac usb data path

From: Raveendran Somu <>

[ 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 <>
Signed-off-by: Chi-hsien Lin <>
Signed-off-by: Kalle Valo <>
Signed-off-by: Sasha Levin <>
 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 2bd892df83cc5..80cc45c9aa4a1 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);
 	} 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;

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