[Xen-devel] [PATCH] xen: fix parse_bool() with empty string

[Juergen Gross <jgross@xxxxxxxx>]

parse_bool() should return -1 in case it is called with an empty
string. In order to allow boolean parameters in the cmdline without
specifying a value this case must be handled in _cmdline_parse() by
always passing a value string.

This fixes commit 532dec8e31174ed450adfd36a4b0b41dec27010d ("xen:
add an optional string end parameter to parse_bool()")

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/common/kernel.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/common/kernel.c b/xen/common/kernel.c
index ec7714961a..71bc547d17 100644
--- a/xen/common/kernel.c
+++ b/xen/common/kernel.c
@@ -114,7 +114,7 @@ static void __init _cmdline_parse(const char *cmdline)
                     simple_strtoll(optval, NULL, 0));
                 break;
             case OPT_BOOL:
-                if ( !parse_bool(optval, NULL) )
+                if ( !parse_bool(*optval ? optval : "yes", NULL) )
                     bool_assert = !bool_assert;
                 assign_integer_param(param, bool_assert);
                 break;
@@ -168,6 +168,8 @@ int __init parse_bool(const char *s, const char *e)
     unsigned int len;
 
     len = e ? ({ ASSERT(e >= s); e - s; }) : strlen(s);
+    if ( !len )
+        return -1;
 
     if ( !strncmp("no", s, len) ||
          !strncmp("off", s, len) ||
-- 
2.12.3


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