script: kallsyms: Use the correct buffer size for symbols

The buffered name size should be larger than KSYM_NAME_LEN, otherwise we
cannot tell whether the size of a symbol name is too long.

Signed-off-by: Boqun Feng <[email protected]>

Author: fbq

scripts/kallsyms.c

@@ -27,6 +27,9 @@
 
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
 
+#define _stringify_1(x)	#x
+#define _stringify(x)	_stringify_1(x)
+
 #define KSYM_NAME_LEN		512
 
 struct sym_entry {
@@ -195,17 +198,23 @@ static void check_symbol_range(const char *sym, unsigned long long addr,
 	}
 }
 
+/*
+ * Must be larger than KSYM_NAME_LEN, so that we know whehter a symbol is too
+ * long.
+ */
+#define BUF_NAME_SIZE	513
+
 static struct sym_entry *read_symbol(FILE *in)
 {
-	char name[500], type;
+	char name[BUF_NAME_SIZE+1], type;
 	unsigned long long addr;
 	unsigned int len;
 	struct sym_entry *sym;
 	int rc;
 
-	rc = fscanf(in, "%llx %c %499s\n", &addr, &type, name);
+	rc = fscanf(in, "%llx %c %" _stringify(BUF_NAME_SIZE) "s\n", &addr, &type, name);
 	if (rc != 3) {
-		if (rc != EOF && fgets(name, 500, in) == NULL)
+		if (rc != EOF && fgets(name, BUF_NAME_SIZE + 1, in) == NULL)
 			fprintf(stderr, "Read error or end of file.\n");
 		return NULL;
 	}