[PATCH 4.19 022/264] nfc: Ensure presence of NFC_ATTR_FIRMWARE_NAME attribute in nfc_genl_fw_download()

[Greg Kroah-Hartman]

From: Defang Bo <bodefang@xxxxxxx>

[ Upstream commit 280e3ebdafb863b3cb50d5842f056267e15bf40c ]

Check that the NFC_ATTR_FIRMWARE_NAME attributes are provided by
the netlink client prior to accessing them.This prevents potential
unhandled NULL pointer dereference exceptions which can be triggered
by malicious user-mode programs, if they omit one or both of these
attributes.

Similar to commit a0323b979f81 ("nfc: Ensure presence of required attributes in the activate_target handler").

Fixes: 9674da8759df ("NFC: Add firmware upload netlink command")
Signed-off-by: Defang Bo <bodefang@xxxxxxx>
Link: https://lore.kernel.org/r/1603107538-4744-1-git-send-email-bodefang@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/nfc/netlink.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1235,7 +1235,7 @@ static int nfc_genl_fw_download(struct s
 	u32 idx;
 	char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
 
-	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME])
 		return -EINVAL;
 
 	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);