[S] Change in coreboot[main]: util/hda-decoder: Protect 'fields' slice if empty string

[Maxim (Code Review)]

Maxim has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/84101?usp=email )

Change subject: util/hda-decoder: Protect 'fields' slice if empty string
......................................................................

util/hda-decoder: Protect 'fields' slice if empty string

This avoids panic if the file contains an empty string or an incorrect
configuration:

goroutine 1 [running]:
main.decodeFile({0x7ffd63da92a0?, 0xc000014070?}, 0x8?)
    /path/to/coreboot/util/hda-decoder/main.go:72 +0x2ef
main.main()
    /path/to/coreboot/util/hda-decoder/main.go:158 +0x2a5

Change-Id: I9ae8544e52d82e8d8a82a88a85a2de7d2f295ec1
Signed-off-by: Maxim Polyakov 
---
M util/hda-decoder/main.go
1 file changed, 13 insertions(+), 12 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/01/84101/1

diff --git a/util/hda-decoder/main.go b/util/hda-decoder/main.go
index 83ddcbb..c1a1b13 100644
--- a/util/hda-decoder/main.go
+++ b/util/hda-decoder/main.go
@@ -68,19 +68,20 @@
    scanner := bufio.NewScanner(file)

for scanner.Scan() {
-		fields := strings.Fields(scanner.Text())
-		pin := stringToUint32(fields[0])
-		config := stringToUint32(fields[1])
+		if fields := strings.Fields(scanner.Text()); len(fields) == 2 {
+			pin := stringToUint32(fields[0])
+			config := stringToUint32(fields[1])

-		indentedPrintf("AZALIA_PIN_CFG(%d, 0x%02x, ", codec, pin)
-		if decoder.PortIsConnected(config) {
-			fmt.Printf("AZALIA_PIN_DESC(\n")
-			indentLevel += 1
-			decodeConfig(config)
-			indentLevel -= 1
-			indentedPrintf(")),\n")
-		} else {
-			printDisconnectedPort(config)
+			indentedPrintf("AZALIA_PIN_CFG(%d, 0x%02x, ", codec, pin)
+			if decoder.PortIsConnected(config) {
+				fmt.Printf("AZALIA_PIN_DESC(\n")
+				indentLevel += 1
+				decodeConfig(config)
+				indentLevel -= 1
+				indentedPrintf(")),\n")
+			} else {
+				printDisconnectedPort(config)
+			}
    	}
    }
 }