From: Samuel Thibault <samuel.thibault@ens-lyon.org>
To: libc-alpha@sourceware.org
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>, commit-hurd@gnu.org
Subject: [hurd, commited] htl: Clear kernel_thread field before releasing the thread structure
Date: Sat, 15 Jan 2022 21:31:55 +0100 [thread overview]
Message-ID: <20220115203155.514291-1-samuel.thibault@ens-lyon.org> (raw)
Otherwise this is a use-after-free.
---
sysdeps/mach/htl/pt-thread-terminate.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/sysdeps/mach/htl/pt-thread-terminate.c b/sysdeps/mach/htl/pt-thread-terminate.c
index 0cf72b330f..9bd6c3434d 100644
--- a/sysdeps/mach/htl/pt-thread-terminate.c
+++ b/sysdeps/mach/htl/pt-thread-terminate.c
@@ -62,15 +62,15 @@ __pthread_thread_terminate (struct __pthread *thread)
? __mig_get_reply_port () : MACH_PORT_NULL;
__mach_port_deallocate (__mach_task_self (), self_ktid);
+ /* The kernel thread won't be there any more. */
+ thread->kernel_thread = MACH_PORT_DEAD;
+
/* Finally done with the thread structure. */
__pthread_dealloc (thread);
/* The wake up port is now no longer needed. */
__mach_port_destroy (__mach_task_self (), wakeup_port);
- /* The kernel thread won't be there any more. */
- thread->kernel_thread = MACH_PORT_DEAD;
-
/* Terminate and release all that's left. */
err = __thread_terminate_release (kernel_thread, mach_task_self (),
kernel_thread, reply_port,
--
2.34.1
reply other threads:[~2022-01-15 20:31 UTC|newest]
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