[PATCH] igb: Add null pointer check to igb_set_fw_version

[Kunwu Chan]

kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure.

Fixes: 1978d3ead82c ("intel: fix string truncation warnings")
Cc: Kunwu Chan <kunwu.chan@xxxxxxxxxxx>
Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index b2295caa2f0a..6838f6fccb80 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -3102,6 +3102,8 @@ void igb_set_fw_version(struct igb_adapter *adapter)
 		break;
 	}
 
+	if (!lbuf)
+		return;
 	/* the truncate happens here if it doesn't fit */
 	strscpy(adapter->fw_version, lbuf, sizeof(adapter->fw_version));
 	kfree(lbuf);
-- 
2.39.2