mwifiex: pcie: Fix memory leak in mwifiex_pcie_alloc_cmdrsp_buf

mainline inclusion
from mainline-v5.4
commit db8fd2cde93227e566a412cf53173ffa227998bc
category: bugfix
bugzilla: 13690
CVE: CVE-2019-19056

-------------------------------------------------

In mwifiex_pcie_alloc_cmdrsp_buf, a new skb is allocated which should be
released if mwifiex_map_pci_memory() fails. The release is added.

Fixes: fc331460 ("mwifiex: use pci_alloc/free_consistent APIs for PCIe")
Signed-off-by: NNavid Emamdoost <navid.emamdoost@gmail.com>
Acked-by: NGanapathi Bhat <gbhat@marvell.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: NWenan Mao <maowenan@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/net/wireless/marvell/mwifiex/pcie.c

@@ -1033,8 +1033,10 @@ static int mwifiex_pcie_alloc_cmdrsp_buf(struct mwifiex_adapter *adapter)
 	}
 	skb_put(skb, MWIFIEX_UPLD_SIZE);
 	if (mwifiex_map_pci_memory(adapter, skb, MWIFIEX_UPLD_SIZE,
-				   PCI_DMA_FROMDEVICE))
+				   PCI_DMA_FROMDEVICE)) {
+		kfree_skb(skb);
 		return -1;
+	}
 
 	card->cmdrsp_buf = skb;