mwifiex: pcie: Fix memory leak in mwifiex_pcie_alloc_cmdrsp_buf

commit db8fd2c upstream.

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: fc33146 ("mwifiex: use pci_alloc/free_consistent APIs for PCIe")
Signed-off-by: Navid Emamdoost <[email protected]>
Acked-by: Ganapathi Bhat <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Cc: Ben Hutchings <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

(cherry picked from commit 6ddbe82)

Orabug: 31246301
CVE: CVE-2019-19056

Signed-off-by: Larry Bassel <[email protected]>
Reviewed-by: George Kennedy <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Author: Navidem

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

@@ -1019,8 +1019,10 @@ 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;