Public bug reported:
setenv ("NAME", NULL) corrupts the environment. It doesn't seem
specified what the function should do when value is NULL, but the code
does check for it - it just does the wrong thing:
stdlib/setenv.c:
...
__add_to_environ (name, value, combined, replace)
...
const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
...
memcpy (new_value, name, namelen);
new_value[namelen] = '=';
memcpy (&new_value[namelen + 1], value, vallen);
...
i.e. the new value is set to "NAME=" without the trailing nul character.
Found in bug 861123 where indicator-datetime does a:
x = g_strdup (getenv ("NAME"));
unsetenv ("NAME");
// do something
setenv ("NAME", x);
** Affects: eglibc
Importance: Unknown
Status: Unknown
** Affects: eglibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/861132
Title:
setenv ("NAME", NULL) corrupts environment
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