[Xen-devel] [PATCH v2 1/4] common/vsprintf: Explicitly treat negative lengths as 'unlimited'

[Tim Deegan <tim@xxxxxxx>]

The old code relied on implictly casting negative numbers to size_t
making a very large limit, which was correct but non-obvious.

Coverity CID 1128575

Signed-off-by: Tim Deegan <tim@xxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/common/vsprintf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/common/vsprintf.c b/xen/common/vsprintf.c
index 1a6198e..0a6fa05 100644
--- a/xen/common/vsprintf.c
+++ b/xen/common/vsprintf.c
@@ -239,7 +239,7 @@ static char *number(
 static char *string(char *str, char *end, const char *s,
                     int field_width, int precision, int flags)
 {
-    int i, len = strnlen(s, precision);
+    int i, len = (precision < 0) ? strlen(s) : strnlen(s, precision);
 
     if (!(flags & LEFT)) {
         while (len < field_width--) {
-- 
1.8.5.2


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