From: trix@redhat.com
To: arend.vanspriel@broadcom.com, franky.lin@broadcom.com,
hante.meuleman@broadcom.com, chi-hsien.lin@cypress.com,
wright.feng@cypress.com, kvalo@codeaurora.org,
davem@davemloft.net, kuba@kernel.org, rafal@milecki.pl,
tklauser@distanz.ch
Cc: linux-wireless@vger.kernel.org,
brcm80211-dev-list.pdl@broadcom.com,
brcm80211-dev-list@cypress.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, Tom Rix <trix@redhat.com>
Subject: [PATCH] brcmfmac: check ndev pointer
Date: Sun, 2 Aug 2020 09:18:04 -0700 [thread overview]
Message-ID: <20200802161804.6126-1-trix@redhat.com> (raw)
From: Tom Rix <trix@redhat.com>
Clang static analysis reports this error
brcmfmac/core.c:490:4: warning: Dereference of null pointer
(*ifp)->ndev->stats.rx_errors++;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In this block of code
if (ret || !(*ifp) || !(*ifp)->ndev) {
if (ret != -ENODATA && *ifp)
(*ifp)->ndev->stats.rx_errors++;
brcmu_pkt_buf_free_skb(skb);
return -ENODATA;
}
(*ifp)->ndev being NULL is caught as an error
But then it is used to report the error.
So add a check before using it.
Fixes: 91b632803ee4 ("brcmfmac: Use net_device_stats from struct net_device")
Signed-off-by: Tom Rix <trix@redhat.com>
---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
index f89010a81ffb..aa9ced3c86fb 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
@@ -486,7 +486,7 @@ static int brcmf_rx_hdrpull(struct brcmf_pub *drvr, struct sk_buff *skb,
ret = brcmf_proto_hdrpull(drvr, true, skb, ifp);
if (ret || !(*ifp) || !(*ifp)->ndev) {
- if (ret != -ENODATA && *ifp)
+ if (ret != -ENODATA && *ifp && (*ifp)->ndev)
(*ifp)->ndev->stats.rx_errors++;
brcmu_pkt_buf_free_skb(skb);
return -ENODATA;
--
2.18.1
next reply other threads:[~2020-08-02 16:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-02 16:18 trix [this message]
2020-08-18 12:50 ` [PATCH] brcmfmac: check ndev pointer Kalle Valo
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