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Fri, 03 Nov 2023 04:36:13 -0700 (PDT) Date: Fri, 03 Nov 2023 04:36:13 -0700 In-Reply-To: <0000000000006655c10608ddfb6d@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000063045b06093de946@google.com> Subject: Re: [syzbot] [PATCH] Test for 2030579113a1 From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: [PATCH] Test for 2030579113a1 Author: eadavis@qq.com please test BUG: corrupted list in ptp_open #syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 2dac75696c6d diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c index 282cd7d24077..6e9762a54b14 100644 --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -119,8 +119,13 @@ int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode) } bitmap_set(queue->mask, 0, PTP_MAX_CHANNELS); spin_lock_init(&queue->lock); + if (mutex_lock_interruptible(&ptp->tsevq_mux)) { + kfree(queue); + return -ERESTARTSYS; + } list_add_tail(&queue->qlist, &ptp->tsevqs); pccontext->private_clkdata = queue; + mutex_unlock(&ptp->tsevq_mux); /* Debugfs contents */ sprintf(debugfsname, "0x%p", queue); @@ -138,14 +143,19 @@ int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode) int ptp_release(struct posix_clock_context *pccontext) { struct timestamp_event_queue *queue = pccontext->private_clkdata; + struct ptp_clock *ptp = + container_of(pccontext->clk, struct ptp_clock, clock); unsigned long flags; if (queue) { + if (mutex_lock_interruptible(&ptp->tsevq_mux)) + return -ERESTARTSYS; debugfs_remove(queue->debugfs_instance); pccontext->private_clkdata = NULL; spin_lock_irqsave(&queue->lock, flags); list_del(&queue->qlist); spin_unlock_irqrestore(&queue->lock, flags); + mutex_unlock(&ptp->tsevq_mux); bitmap_free(queue->mask); kfree(queue); } @@ -585,7 +595,5 @@ ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags, free_event: kfree(event); exit: - if (result < 0) - ptp_release(pccontext); return result; } diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c index 3d1b0a97301c..7930db6ec18d 100644 --- a/drivers/ptp/ptp_clock.c +++ b/drivers/ptp/ptp_clock.c @@ -176,6 +176,7 @@ static void ptp_clock_release(struct device *dev) ptp_cleanup_pin_groups(ptp); kfree(ptp->vclock_index); + mutex_destroy(&ptp->tsevq_mux); mutex_destroy(&ptp->pincfg_mux); mutex_destroy(&ptp->n_vclocks_mux); /* Delete first entry */ @@ -247,6 +248,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, if (!queue) goto no_memory_queue; list_add_tail(&queue->qlist, &ptp->tsevqs); + mutex_init(&ptp->tsevq_mux); queue->mask = bitmap_alloc(PTP_MAX_CHANNELS, GFP_KERNEL); if (!queue->mask) goto no_memory_bitmap; @@ -356,6 +358,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, if (ptp->kworker) kthread_destroy_worker(ptp->kworker); kworker_err: + mutex_destroy(&ptp->tsevq_mux); mutex_destroy(&ptp->pincfg_mux); mutex_destroy(&ptp->n_vclocks_mux); bitmap_free(queue->mask); diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h index 52f87e394aa6..1525bd2059ba 100644 --- a/drivers/ptp/ptp_private.h +++ b/drivers/ptp/ptp_private.h @@ -44,6 +44,7 @@ struct ptp_clock { struct pps_device *pps_source; long dialed_frequency; /* remembers the frequency adjustment */ struct list_head tsevqs; /* timestamp fifo list */ + struct mutex tsevq_mux; /* one process at a time reading the fifo */ struct mutex pincfg_mux; /* protect concurrent info->pin_config access */ wait_queue_head_t tsev_wq; int defunct; /* tells readers to go away when clock is being removed */ -- 2.25.1