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Win32: fix environment memory leaks

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All functions that modify the environment have memory leaks.

Disable gitunsetenv in the Makefile and use env_setenv (via mingw_putenv)
instead (this frees removed environment entries).

Move xstrdup from env_setenv to make_augmented_environ, so that
mingw_putenv no longer copies the environment entries (according to POSIX
[1], "the string [...] shall become part of the environment"). This also
fixes the memory leak in gitsetenv, which expects a POSIX compliant putenv.

[1] http://pubs.opengroup.org/onlinepubs/009695399/functions/putenv.html

Note: This patch depends on taking control of char **environ and having
our own mingw_putenv (both introduced in "Win32: Unicode environment
(incoming)").

Signed-off-by: Karsten Blees <blees@dcon.de>
Signed-off-by: Stepan Kasal <kasal@ucw.cz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karsten Blees 2014-07-17 17:37:57 +02:00 committed by Junio C Hamano
parent b729f98fa5
commit e96942e821
3 changed files with 7 additions and 6 deletions
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10
compat/mingw.c
View file

@ -1220,14 +1220,14 @@ static char **env_setenv(char **env, const char *name)
for (i = 0; env[i]; i++)
;
env = xrealloc(env, (i+2)*sizeof(*env));
env[i] = xstrdup(name);
env[i] = (char*) name;
env[i+1] = NULL;
}
}
else {
free(env[i]);
if (*eq)
env[i] = xstrdup(name);
env[i] = (char*) name;
else
for (; env[i]; i++)
env[i] = env[i+1];
@ -1242,8 +1242,10 @@ char **make_augmented_environ(const char *const *vars)
{
char **env = copy_environ();
while (*vars)
env = env_setenv(env, *vars++);
while (*vars) {
const char *v = *vars++;
env = env_setenv(env, strchr(v, '=') ? xstrdup(v) : v);
}
return env;
}

1
compat/mingw.h
View file

@ -209,6 +209,7 @@ char *mingw_getenv(const char *name);
#define getenv mingw_getenv
int mingw_putenv(const char *namevalue);
#define putenv mingw_putenv
#define unsetenv mingw_putenv
int mingw_gethostname(char *host, int namelen);
#define gethostname mingw_gethostname

2
config.mak.uname
View file

@ -326,7 +326,6 @@ ifeq ($(uname_S),Windows)
NO_IPV6 = YesPlease
NO_UNIX_SOCKETS = YesPlease
NO_SETENV = YesPlease
NO_UNSETENV = YesPlease
NO_STRCASESTR = YesPlease
NO_STRLCPY = YesPlease
NO_MEMMEM = YesPlease
@ -479,7 +478,6 @@ ifneq (,$(findstring MINGW,$(uname_S)))
NO_SYMLINK_HEAD = YesPlease
NO_UNIX_SOCKETS = YesPlease
NO_SETENV = YesPlease
NO_UNSETENV = YesPlease
NO_STRCASESTR = YesPlease
NO_STRLCPY = YesPlease
NO_MEMMEM = YesPlease