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Hurd: Fix __dup3 _hurd_dtable_lock usage.

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This commit is contained in:
Samuel Thibault 2012-05-10 15:49:30 -07:00 committed by Roland McGrath
parent 674cdbc7a3
commit f34d6f840e
2 changed files with 9 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2012-05-10 Samuel Thibault <samuel.thibault@ens-lyon.org>
* sysdeps/mach/hurd/dup3.c: Lock _hurd_dtable_lock before
checking for _hurd_dtablesize. Unlock it right after having
finished _hurd_dtable allocation.
2012-05-10 Thomas Schwinge <thomas@schwinge.name>
* sysdeps/mach/hurd/configure.in: Remove warning for --prefix=[...].

7
sysdeps/mach/hurd/dup3.c
View File

@ -71,15 +71,14 @@ __dup3 (int fd, int fd2, int flags)
/* Get a hold of the destination descriptor. */
struct hurd_fd *d2;
__mutex_lock (&_hurd_dtable_lock);
if (fd2 >= _hurd_dtablesize)
{
/* The table is not large enough to hold the destination
descriptor. Enlarge it as necessary to allocate this
descriptor. */
__mutex_unlock (&_hurd_dtable_lock);
/* We still hold FD1's lock, but this is safe because
_hurd_alloc_fd will only examine the cells starting
at FD2. */
d2 = _hurd_alloc_fd (NULL, fd2);
if (d2)
__spin_unlock (&d2->port.lock);
@ -99,6 +98,7 @@ __dup3 (int fd, int fd2, int flags)
MACH_PORT_NULL);
}
}
__mutex_unlock (&_hurd_dtable_lock);
if (d2 == NULL)
{
@ -126,7 +126,6 @@ __dup3 (int fd, int fd2, int flags)
_hurd_port_locked_set (&d2->port, port); /* Unlocks D2. */
}
}
__mutex_unlock (&_hurd_dtable_lock);
_hurd_port_free (&d->port, &ulink, port);
if (ctty != MACH_PORT_NULL)