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openpty: close slave pty fd on error

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When openpty() failed only the master fd was closed so far. Let's close the
slave fd as well. Also, let's unify the error handling.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2017-10-08 14:09:47 +02:00
parent e7a5745949
commit 98e0742024
2 changed files with 20 additions and 14 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2017-10-08 Christian Brauner <christian.brauner@ubuntu.com>
* login/openpty.c (openpty): Close slave pty file descriptor on error.
2017-10-06 Joseph Myers <joseph@codesourcery.com>
* sysdeps/ieee754/ldbl-128/s_fma.c: Include <libm-alias-double.h>.

30
login/openpty.c
View File

@ -92,29 +92,24 @@ openpty (int *amaster, int *aslave, char *name,
char _buf[512];
#endif
char *buf = _buf;
int master, slave;
int master, ret = -1, slave = -1;
master = getpt ();
if (master == -1)
return -1;
if (grantpt (master))
goto fail;
goto on_error;
if (unlockpt (master))
goto fail;
goto on_error;
if (pts_name (master, &buf, sizeof (_buf)))
goto fail;
goto on_error;
slave = open (buf, O_RDWR | O_NOCTTY);
if (slave == -1)
{
if (buf != _buf)
free (buf);
goto fail;
}
goto on_error;
/* XXX Should we ignore errors here? */
if (termp)
@ -129,12 +124,19 @@ openpty (int *amaster, int *aslave, char *name,
if (name != NULL)
strcpy (name, buf);
ret = 0;
on_error:
if (ret == -1) {
close (master);
if (slave != -1)
close (slave);
}
if (buf != _buf)
free (buf);
return 0;
fail:
close (master);
return -1;
return ret;
}
libutil_hidden_def (openpty)