[PATCH] brcmfmac: check ndev pointer

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

trix@redhat.com wrote:

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>

Patch applied to wireless-drivers-next.git, thanks.

9c9f015bc9f8 brcmfmac: check ndev pointer

-- 
https://patchwork.kernel.org/patch/11696567/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches