[PATCH 04/13] Win32: fix environment memory leaks
- From
Stepan Kasal <kasal@ucw.cz>
- Date
- Jul 17, 2014, 15:37 UTC
- Message-ID
- <1405611486-10176-5-git-send-email-kasal@ucw.cz>
- In-Reply-To
- <1405611486-10176-1-git-send-email-kasal@ucw.cz>
From: Karsten Blees <blees@dcon.de>
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> --- compat/mingw.c | 10 ++++++---- compat/mingw.h | 1 + config.mak.uname | 2 -- 3 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/compat/mingw.c b/compat/mingw.c index eadba8a..47e866c 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -1219,14 +1219,14 @@ 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]; @@ -1241,8 +1241,10 @@ 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; } diff --git a/compat/mingw.h b/compat/mingw.h index c3889ca..ef94194 100644 --- a/compat/mingw.h +++ b/compat/mingw.h @@ -212,6 +212,7 @@ 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 diff --git a/config.mak.uname b/config.mak.uname index 00cf4c6..15ee15e 100644 --- a/config.mak.uname +++ b/config.mak.uname @@ -327,7 +327,6 @@ ifeq ($(uname_S),Windows) NO_IPV6 = YesPlease NO_UNIX_SOCKETS = YesPlease NO_SETENV = YesPlease - NO_UNSETENV = YesPlease NO_STRCASESTR = YesPlease NO_STRLCPY = YesPlease NO_MEMMEM = YesPlease @@ -480,7 +479,6 @@ ifneq (,$(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
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