[PATCH kvm-unit-tests 1/3] lib/string: Fix getenv name matching

[Andrew Jones <drjones@xxxxxxxxxx>]

Without confirming that the name length exactly matches too, then
the string comparison would return the same value for VAR* as for
VAR, when VAR came first in the environ array.

Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
---
 lib/string.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/string.c b/lib/string.c
index 018dcc879516..3a0562120f12 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -171,10 +171,13 @@ extern char **environ;
 char *getenv(const char *name)
 {
     char **envp = environ, *delim;
+    int len;
 
     while (*envp) {
         delim = strchr(*envp, '=');
-        if (delim && strncmp(name, *envp, delim - *envp) == 0)
+        assert(delim);
+        len = delim - *envp;
+        if (strlen(name) == len && strncmp(name, *envp, len) == 0)
             return delim + 1;
         ++envp;
     }
-- 
2.26.2